Hi Daniel,

Thank you for your prompt response!

I sent the wrong trace with the added transport=tcp test. Yes we tried to add the transport=tcp on config to overcome this issue but it was not resolved. I will contact the provider to ask them to add the transport on their 183 and I believe it will resolve the issue. In case they cannot do this is there an alternative to bypass this? As per now we have the save issue also on our ACK and BYE replies we send to the provider which is logical.

Kind regards, Angelo

Στις Τρί, 21 Σεπ 2021 στις 5:03 μ.μ., ο/η Daniel-Constantin Mierla < miconda@gmail.com> έγραψε:

Hello,

the contact of the 183 has no transport parameter, which means it is the default one, respectively UDP. If the Provider wants traffic over TCP, the contact has to be with that transport parameter.

I see that incoming PRACK has R-URI without transport parameter, but the one to be forwarded has a malformed version where transport=tcp is misplaced, probably due to a wrong config operation. If you do it in kamailio.cfg, you have to append ";transport=tcp" to $ru (whole r-uri), not to $rU (only user part of r-uri).

Cheers, Daniel On 21.09.21 15:29, Angelo Sipper wrote:

Correction UAC (OverTLS) ->(TLS)Kamailio1(UDP)-> (UDP)Kamailio2(TCP)-> (TCP)Provider

Στις Τρί, 21 Σεπ 2021 στις 4:28 μ.μ., ο/η Angelo Sipper < sippro97@gmail.com> έγραψε:

...

Hello,

We have the following setup and I am having trouble passing the PRACK with correct protocol to the provider.

UAC (OverTLS) ->(UDP)Kamailio1 (UDP)-> (UDP)Kamailio2 (TCP)-> (TCP)Provider

UAC : 10.2.1.160 NATED to 100.100.100.61 http://50.50.50.50:5065/ (TLS) Kamailio1 Sockets: 50.50.50.210:5061 http://170.170.170.210:5061/ (TLS),50.50.50.210:5060 http://170.170.170.210:5060/ (UDP) Kamailio2 Sockets: 50.50.50.182:5060 http://170.170.170.170:5060/ (UDP) 50.50.50.182:5080 http://170.170.170.170:5060/ (TCP) Provider: 200.200.200.209:5060 http://200.200.200.193:5060/ (TCP)

We use dispatcher on Kamailio1 & Kamailio2 The invite goes fine from UCA up to the provider and the provider responses arrive to UAC fine. The PRACK from UAC to kamailio1 goes fine to Kamaili02 but, Kamailio2 uses the UDP socket to send to the provider so the PRACK does not arrive to the provider and the call is canceled. If the provider is on UDP everything works fine.

Below I have the trace. What should I look for in the config to resolve this wrong protocol/socket on the PRACK?

Kamailio2 Details:

Sockets

listen=udp:50.50.50.182:5060 listen=tcp: 50.50.50.182:5080

On the rr module I have

modparam("rr", "enable_double_rr", 1) modparam("rr", "append_fromtag", 1) modparam("rr", "enable_full_lr", 1)

CONFIG REQINIT & WITHINDLG PARTS

route[REQINIT] {

set_reply_no_connect(); force_rport();

if (!mf_process_maxfwd_header("10")) { xlog("L_ERROR","Too Many Hops Rejecting!"); sl_send_reply("483","Too Many Hops"); exit; }

if(is_method("OPTIONS") && uri==myself && $rU==$null) { sl_send_reply("200","Keepalive"); exit; }

if(!sanity_check("1511", "7")) { xlog("Malformed SIP message from $si:$sp sanity 1511\n"); exit; }

if(!sanity_check("17895", "7")) { xlog("Malformed SIP request from $si:$sp sanity 17895\n"); exit; } }

route[WITHINDLG] { if (!has_totag()) return;

if (loose_route()) {

if (is_method("BYE")) { rtpengine_query(); rtpengine_delete(); } route(RELAY_OUT); }

if ( is_method("ACK") ) { #if (t_lookup_request()) { if (t_check_trans()) { route(RELAY_OUT); exit; } else { # ACK without matching transaction ... ignore and discard exit; } }

sl_send_reply("404","Not Allowed"); exit; }

TRACE

       50.50.50.210:5060             50.50.50.182:5060

50.50.50.182:32818 200.200.200.209:5060 qqqqqqqqqqwqqqqqqq qqqqqqqqqqwqqqqqqq qqqqqqqqqqwqqqqqqqq qqqqqqqqqqqwqqqqqqqqq a 15:31:11.787490 x INVITE (SDP) x x x a +0.003099 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:11.790589 x 100 trying -- your call is x x x a +0.002220 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:11.792809 x x x INVITE (SDP) x a +0.020725 x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:11.813534 x x x 100 Trying x a +2.628884 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:14.442418 x x x 183 Session Progress (SDP) x a +0.001572 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:14.443990 x 183 Session Progress (SDP) x x x a +0.299221 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:14.743211 x PRACK x x x a +0.043114 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:14.786325 x x PRACK x a +0.448104 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:15.234429 x PRACK x x x a +0.045697 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:15.280126 x x PRACK x a +0.954153 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:16.234279 x PRACK x x x a +0.045832 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:16.280111 x x PRACK x a +1.954170 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:18.234281 x PRACK x x x a +0.045839 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:18.280120 x x PRACK x a +1.829676 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:20.109796 x x x 183 Session Progress (SDP) x a +0.001460 x x x <<<qqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:20.111256 x 183 Session Progress (SDP) x x x a +2.123075 x <<<qqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:22.234331 x PRACK x x x a +0.045825 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:22.280156 x x PRACK x a +2.239640 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:24.519796 x x x 486 Busy Here x a +0.000555 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:24.520351 x x x ACK x a +0.008965 x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:24.529316 x 486 Busy Here x x x a +0.000835 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:24.530151 x ACK x x x a +1.704184 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:26.234335 x PRACK x x x a +0.045856 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:26.280191 x x PRACK x a +3.954734 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:30.234925 x PRACK x x x x +0.045279 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x x 15:31:30.280204 x x PRACK x x +3.954116 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x x 15:31:34.234320 x PRACK x x x

2021/09/21 15:31:11.787490 50.50.50.210:5060 -> 50.50.50.182:5060 INVITE sip:123456789@sip.mydomain.com:5060 SIP/2.0 Record-Route: sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias Max-Forwards: 69 From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Contact: "MyUserNAme" sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 User-Agent: MicroSIP/3.20.5 Content-Type: application/sdp Content-Length: 326 P-Asserted-Identity: sip:987654321@sip.mydomain.com

v=0 o=- 3841227071 3841227071 IN IP4 50.50.50.215 s=pjmedia b=AS:84 t=0 0 a=X-nat:0 m=audio 36448 RTP/AVP 8 0 101 c=IN IP4 50.50.50.215 b=TIAS:64000 a=ssrc:2024148033 cname:4f2468fd611910fa a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:36449

2021/09/21 15:31:11.790589 50.50.50.182:5060 -> 50.50.50.210:5060 SIP/2.0 100 trying -- your call is important to us Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3;rport=5060 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Server: myserver Content-Length: 0

2021/09/21 15:31:11.792809 50.50.50.182:32818 -> 200.200.200.209:5060 INVITE sip:123456789@sip.mydomain.com:5060 SIP/2.0 Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias Max-Forwards: 68 From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Contact: "MyUserNAme" sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 Content-Type: application/sdp Content-Length: 326 P-Asserted-Identity: sip:987654321@sip.mydomain.com

v=0 o=- 3841227071 3841227071 IN IP4 50.50.50.183 s=pjmedia b=AS:84 t=0 0 a=X-nat:0 m=audio 29308 RTP/AVP 8 0 101 c=IN IP4 50.50.50.183 b=TIAS:64000 a=ssrc:2024148033 cname:4f2468fd611910fa a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:29309

2021/09/21 15:31:11.813534 200.200.200.209:5060 -> 50.50.50.182:32818 SIP/2.0 100 Trying Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Content-Length: 0

2021/09/21 15:31:14.442418 200.200.200.209:5060 -> 50.50.50.182:32818 SIP/2.0 183 Session Progress Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Contact: sip:123456789@200.200.200.209:5060 Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Require: 100rel RSeq: 1509 Content-Length: 241 Content-Disposition: session; handling=required Content-Type: application/sdp

v=0 o=Sonus_UAC 12038 7929 IN IP4 200.200.200.209 s=SIP Media Capabilities c=IN IP4 200.200.200.212 t=0 0 m=audio 17366 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=maxptime:20

2021/09/21 15:31:14.443990 50.50.50.182:5060 -> 50.50.50.210:5060 SIP/2.0 183 Session Progress Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Contact: sip:123456789@200.200.200.209:5060 Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Require: 100rel RSeq: 1509 Content-Length: 253 Content-Disposition: session; handling=required Content-Type: application/sdp

v=0 o=Sonus_UAC 12038 7929 IN IP4 50.50.50.183 s=SIP Media Capabilities c=IN IP4 50.50.50.183 t=0 0 m=audio 29320 RTP/AVP 8 101 a=maxptime:20 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=rtcp:29321

2021/09/21 15:31:14.743211 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:14.786325 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:15.234429 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:15.280126 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:16.234279 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:16.280111 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:18.234281 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

Any help will be much appreciated.

Kind regards, Angelo

---

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-- Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - Online Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)

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Hi Daniel,

Provider managed to add the transport=tcp in the contact as you suggested and call flow was fine but, another issue came up and I believe it is again TCP that causes this issue. If our side terminates the call, our Kamailio2 sends the BYE and it is accepted from the provider side terminating the call correctly. When the far end terminates the call, providers send a BYE that we never receive from the provider and our UAC remains on call. If our UAC terminates the call after the far end terminates the call we receive a 481 from the provider as the call actually does not exist any more on his side and this makes sense. Even this is not the case, to be 100% sure we have even completely disabled our firewall on the tests but we have the same results. Below I am sending you the provider trace that he sends 2 BYE to us without any response from us. These two BYE never reached our side. For testing we even changed the TCP listen port of kamailio to 5080 to be separate ports from the UDP which remains on 5060 Provider engineers cannot respond to this problem with a resolution. Can you please check if you can see something in the trace that can identify the cause of this behavior? Is it something I can change on our Kamailio2 config to avoid this?

TRACE ====== INVITE sip:123456789@sip.mydomain.com:5060 SIP/2.0 Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0 Max-Forwards: 68 From: 987654321 <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11769 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 Content-Type: application/sdp Content-Length: 324 P-Asserted-Identity: sip:987654321@sip.mydomain.com Contact: sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp v=0 o=- 3841298833 3841298833 IN IP4 50.50.50.184 s=pjmedia b=AS:84 t=0 0 a=X-nat:0 m=audio 27892 RTP/AVP 8 0 101 c=IN IP4 50.50.50.184 b=TIAS:64000 a=ssrc:83234588 cname:6b760b5029f225e8 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:27893

--- SEND ----------->-------------> [Message: 2 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:16.00120

SIP/2.0 183 Session Progress Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0 From: 987654321 <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11769 INVITE Contact: sip:123456789@200.200.200.209:5060;transport=tcp Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Require: 100rel RSeq: 6618 Content-Length: 242 Content-Disposition: session; handling=required Content-Type: application/sdp v=0 o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209 s=SIP Media Capabilities c=IN IP4 200.200.200.211 t=0 0 m=audio 27992 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=maxptime:20

<--- RECV -----------<-------------< [Message: 3 of 12 ] <------------<------------<

Date: 09-22-2021 Time: 08:27:17.00047

PRACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bKdd1.b4a7f8fbbf8027cc1b0a457f9e5963f7.0 Max-Forwards: 68 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11770 PRACK RAck: 6618 11769 INVITE Content-Length: 0 Contact: sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp

--- SEND ----------->-------------> [Message: 4 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:17.00050

SIP/2.0 200 OK Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bKdd1.b4a7f8fbbf8027cc1b0a457f9e5963f7.0 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11770 PRACK Content-Length: 0

--- SEND ----------->-------------> [Message: 5 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:17.00053

SIP/2.0 183 Session Progress Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0 From: 987654321 <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11769 INVITE Require: 100rel RSeq: 6619 Contact: sip:123456789@200.200.200.209:5060;transport=tcp Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Content-Length: 242 Content-Disposition: session; handling=required Content-Type: application/sdp v=0 o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209 s=SIP Media Capabilities c=IN IP4 200.200.200.211 t=0 0 m=audio 27992 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=maxptime:20

<--- RECV -----------<-------------< [Message: 6 of 12 ] <------------<------------<

Date: 09-22-2021 Time: 08:27:17.00059

PRACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bKed1.fd8ecce909458a05324665afccdde954.0 Max-Forwards: 68 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11771 PRACK RAck: 6619 11769 INVITE Content-Length: 0 Contact: sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp

--- SEND ----------->-------------> [Message: 7 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:17.00062

SIP/2.0 200 OK Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bKed1.fd8ecce909458a05324665afccdde954.0 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11771 PRACK Content-Length: 0

--- SEND ----------->-------------> [Message: 8 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:20.00083

SIP/2.0 200 OK Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0 From: 987654321 <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11769 INVITE Accept: application/sdp, application/isup, application/dtmf, application/dtmf-relay, multipart/mixed Contact: sip:123456789@200.200.200.209:5060;transport=tcp Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS P-Asserted-Identity: sip:6932489919@MOBILE.PROVIDER.COM;user=phone Require: timer Supported: timer Session-Expires: 1800;refresher=uas Content-Length: 242 Content-Disposition: session; handling=required Content-Type: application/sdp v=0 o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209 s=SIP Media Capabilities c=IN IP4 200.200.200.211 t=0 0 m=audio 27992 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=maxptime:20

<--- RECV -----------<-------------< [Message: 9 of 12 ] <------------<------------<

Date: 09-22-2021 Time: 08:27:20.00102

ACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK4e1.d06307f54416ad3db79569f704d8658e.0 Max-Forwards: 68 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11769 ACK Content-Length: 0 Contact: sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp

--- SEND ----------->-------------> [Message: 10 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:26.00061

BYE sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 200.200.200.209:5060;branch=z9hG4bK0dB7cb270586eb0337b From: sip:123456789@sip.mydomain.com;tag=gK0df944e5 To: "987654321" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 9423 BYE Max-Forwards: 70 Supported: 100rel Content-Length: 0

--- SEND ----------->-------------> [Message: 11 of 12 ] ------------>------------>

Date: 09-22-2021 Time: 08:27:32.00010

BYE sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 200.200.200.209:5060;branch=z9hG4bK0dB7cb270586eb0337b From: sip:123456789@sip.mydomain.com;tag=gK0df944e5 To: "987654321" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 9423 BYE Max-Forwards: 70 Supported: 100rel Content-Length: 0

<--- RECV -----------<-------------< [Message: 12 of 12 ] <------------<------------<

Date: 09-22-2021 Time: 08:27:33.00021

BYE sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0 Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bKbd1.38c5755274f4163db0542d5ec9549053.0 Max-Forwards: 68 From: "MyUserName" <sip:987654321@sip.mydomain.com

;tag=b695280bab3644b78ac5e09a5dba5ac4

To: sip:123456789@sip.mydomain.com;tag=gK0df944e5 Call-ID: d7ecb3b2408a466ea3074d1b48499bfa CSeq: 11772 BYE User-Agent: MicroSIP/3.20.5 Content-Length: 0 Contact: sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp

Kind regards, Angelo

Στις Τετ, 22 Σεπ 2021 στις 9:12 π.μ., ο/η Daniel-Constantin Mierla < miconda@gmail.com> έγραψε:

Hello, On 21.09.21 16:55, Angelo Sipper wrote:

Hi Daniel,

Thank you for your prompt response!

I sent the wrong trace with the added transport=tcp test. Yes we tried to add the transport=tcp on config to overcome this issue but it was not resolved. I will contact the provider to ask them to add the transport on their 183 and I believe it will resolve the issue. In case they cannot do this is there an alternative to bypass this?

you have the flexibility to set the transport to $du or $ru and then relay. Or look at tm module, there are functions that can enforce a specific transport layer. Solutions can be made in config, but the best would be that the provider fixes it, otherwise you have to make a more complex config file to figure out if you have to enforce the transport manually or not, assuming you route calls to other endpoints that set the proper transport value.

Cheers, Daniel

As per now we have the save issue also on our ACK and BYE replies we send to the provider which is logical.

Kind regards, Angelo

Στις Τρί, 21 Σεπ 2021 στις 5:03 μ.μ., ο/η Daniel-Constantin Mierla < miconda@gmail.com> έγραψε:

...

Hello,

the contact of the 183 has no transport parameter, which means it is the default one, respectively UDP. If the Provider wants traffic over TCP, the contact has to be with that transport parameter.

I see that incoming PRACK has R-URI without transport parameter, but the one to be forwarded has a malformed version where transport=tcp is misplaced, probably due to a wrong config operation. If you do it in kamailio.cfg, you have to append ";transport=tcp" to $ru (whole r-uri), not to $rU (only user part of r-uri).

Cheers, Daniel On 21.09.21 15:29, Angelo Sipper wrote:

Correction UAC (OverTLS) ->(TLS)Kamailio1(UDP)-> (UDP)Kamailio2(TCP)-> (TCP)Provider

Στις Τρί, 21 Σεπ 2021 στις 4:28 μ.μ., ο/η Angelo Sipper < sippro97@gmail.com> έγραψε:

...

Hello,

We have the following setup and I am having trouble passing the PRACK with correct protocol to the provider.

UAC (OverTLS) ->(UDP)Kamailio1 (UDP)-> (UDP)Kamailio2 (TCP)-> (TCP)Provider

UAC : 10.2.1.160 NATED to 100.100.100.61 http://50.50.50.50:5065/ (TLS) Kamailio1 Sockets: 50.50.50.210:5061 http://170.170.170.210:5061/ (TLS),50.50.50.210:5060 http://170.170.170.210:5060/ (UDP) Kamailio2 Sockets: 50.50.50.182:5060 http://170.170.170.170:5060/ (UDP) 50.50.50.182:5080 http://170.170.170.170:5060/ (TCP) Provider: 200.200.200.209:5060 http://200.200.200.193:5060/ (TCP)

We use dispatcher on Kamailio1 & Kamailio2 The invite goes fine from UCA up to the provider and the provider responses arrive to UAC fine. The PRACK from UAC to kamailio1 goes fine to Kamaili02 but, Kamailio2 uses the UDP socket to send to the provider so the PRACK does not arrive to the provider and the call is canceled. If the provider is on UDP everything works fine.

Below I have the trace. What should I look for in the config to resolve this wrong protocol/socket on the PRACK?

Kamailio2 Details:

Sockets

listen=udp:50.50.50.182:5060 listen=tcp: 50.50.50.182:5080

On the rr module I have

modparam("rr", "enable_double_rr", 1) modparam("rr", "append_fromtag", 1) modparam("rr", "enable_full_lr", 1)

CONFIG REQINIT & WITHINDLG PARTS

route[REQINIT] {

set_reply_no_connect(); force_rport();

if (!mf_process_maxfwd_header("10")) { xlog("L_ERROR","Too Many Hops Rejecting!"); sl_send_reply("483","Too Many Hops"); exit; }

if(is_method("OPTIONS") && uri==myself && $rU==$null) { sl_send_reply("200","Keepalive"); exit; }

if(!sanity_check("1511", "7")) { xlog("Malformed SIP message from $si:$sp sanity 1511\n"); exit; }

if(!sanity_check("17895", "7")) { xlog("Malformed SIP request from $si:$sp sanity 17895\n"); exit; } }

route[WITHINDLG] { if (!has_totag()) return;

if (loose_route()) {

if (is_method("BYE")) { rtpengine_query(); rtpengine_delete(); } route(RELAY_OUT); }

if ( is_method("ACK") ) { #if (t_lookup_request()) { if (t_check_trans()) { route(RELAY_OUT); exit; } else { # ACK without matching transaction ... ignore and discard exit; } }

sl_send_reply("404","Not Allowed"); exit; }

TRACE

       50.50.50.210:5060             50.50.50.182:5060

50.50.50.182:32818 200.200.200.209:5060 qqqqqqqqqqwqqqqqqq qqqqqqqqqqwqqqqqqq qqqqqqqqqqwqqqqqqqq qqqqqqqqqqqwqqqqqqqqq a 15:31:11.787490 x INVITE (SDP) x x x a +0.003099 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:11.790589 x 100 trying -- your call is x x x a +0.002220 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:11.792809 x x x INVITE (SDP) x a +0.020725 x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:11.813534 x x x 100 Trying x a +2.628884 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:14.442418 x x x 183 Session Progress (SDP) x a +0.001572 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:14.443990 x 183 Session Progress (SDP) x x x a +0.299221 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:14.743211 x PRACK x x x a +0.043114 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:14.786325 x x PRACK x a +0.448104 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:15.234429 x PRACK x x x a +0.045697 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:15.280126 x x PRACK x a +0.954153 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:16.234279 x PRACK x x x a +0.045832 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:16.280111 x x PRACK x a +1.954170 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:18.234281 x PRACK x x x a +0.045839 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:18.280120 x x PRACK x a +1.829676 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:20.109796 x x x 183 Session Progress (SDP) x a +0.001460 x x x <<<qqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:20.111256 x 183 Session Progress (SDP) x x x a +2.123075 x <<<qqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:22.234331 x PRACK x x x a +0.045825 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x a 15:31:22.280156 x x PRACK x a +2.239640 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:24.519796 x x x 486 Busy Here x a +0.000555 x x x <qqqqqqqqqqqqqqqqqqqqqqqqqq x a 15:31:24.520351 x x x ACK x a +0.008965 x x x qqqqqqqqqqqqqqqqqqqqqqqqqq> x a 15:31:24.529316 x 486 Busy Here x x x a +0.000835 x <qqqqqqqqqqqqqqqqqqqqqqqqqq x x x a 15:31:24.530151 x ACK x x x a +1.704184 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:26.234335 x PRACK x x x a +0.045856 x qqqqqqqqqqqqqqqqqqqqqqqqqq> x x x a 15:31:26.280191 x x PRACK x a +3.954734 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x a 15:31:30.234925 x PRACK x x x x +0.045279 x qqqqqqqqqqqqqqqqqqqqqqqq>>> x x x x 15:31:30.280204 x x PRACK x x +3.954116 x x qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>> x x 15:31:34.234320 x PRACK x x x

2021/09/21 15:31:11.787490 50.50.50.210:5060 -> 50.50.50.182:5060 INVITE sip:123456789@sip.mydomain.com:5060 SIP/2.0 Record-Route: sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias Max-Forwards: 69 From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Contact: "MyUserNAme" sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 User-Agent: MicroSIP/3.20.5 Content-Type: application/sdp Content-Length: 326 P-Asserted-Identity: sip:987654321@sip.mydomain.com

v=0 o=- 3841227071 3841227071 IN IP4 50.50.50.215 s=pjmedia b=AS:84 t=0 0 a=X-nat:0 m=audio 36448 RTP/AVP 8 0 101 c=IN IP4 50.50.50.215 b=TIAS:64000 a=ssrc:2024148033 cname:4f2468fd611910fa a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:36449

2021/09/21 15:31:11.790589 50.50.50.182:5060 -> 50.50.50.210:5060 SIP/2.0 100 trying -- your call is important to us Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3;rport=5060 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Server: myserver Content-Length: 0

2021/09/21 15:31:11.792809 50.50.50.182:32818 -> 200.200.200.209:5060 INVITE sip:123456789@sip.mydomain.com:5060 SIP/2.0 Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias Max-Forwards: 68 From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com Contact: "MyUserNAme" sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS Supported: replaces, 100rel, timer, norefersub Session-Expires: 1800 Min-SE: 90 Content-Type: application/sdp Content-Length: 326 P-Asserted-Identity: sip:987654321@sip.mydomain.com

v=0 o=- 3841227071 3841227071 IN IP4 50.50.50.183 s=pjmedia b=AS:84 t=0 0 a=X-nat:0 m=audio 29308 RTP/AVP 8 0 101 c=IN IP4 50.50.50.183 b=TIAS:64000 a=ssrc:2024148033 cname:4f2468fd611910fa a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=sendrecv a=rtcp:29309

2021/09/21 15:31:11.813534 200.200.200.209:5060 -> 50.50.50.182:32818 SIP/2.0 100 Trying Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Content-Length: 0

2021/09/21 15:31:14.442418 200.200.200.209:5060 -> 50.50.50.182:32818 SIP/2.0 183 Session Progress Via: SIP/2.0/TCP 50.50.50.182:5080 ;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Contact: sip:123456789@200.200.200.209:5060 Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Require: 100rel RSeq: 1509 Content-Length: 241 Content-Disposition: session; handling=required Content-Type: application/sdp

v=0 o=Sonus_UAC 12038 7929 IN IP4 200.200.200.209 s=SIP Media Capabilities c=IN IP4 200.200.200.212 t=0 0 m=audio 17366 RTP/AVP 8 101 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=maxptime:20

2021/09/21 15:31:14.443990 50.50.50.182:5060 -> 50.50.50.210:5060 SIP/2.0 183 Session Progress Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias From: 987654321 <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14320 INVITE Record-Route: sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Record-Route: sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Record-Route: sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes Contact: sip:123456789@200.200.200.209:5060 Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS Require: 100rel RSeq: 1509 Content-Length: 253 Content-Disposition: session; handling=required Content-Type: application/sdp

v=0 o=Sonus_UAC 12038 7929 IN IP4 50.50.50.183 s=SIP Media Capabilities c=IN IP4 50.50.50.183 t=0 0 m=audio 29320 RTP/AVP 8 101 a=maxptime:20 a=rtpmap:8 PCMA/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-15 a=sendrecv a=rtcp:29321

2021/09/21 15:31:14.743211 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:14.786325 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:15.234429 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:15.280126 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:16.234279 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:16.280111 50.50.50.182:5060 -> 200.200.200.209:5060 PRACK sip:123456789transport=tcp@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0 Via: SIP/2.0/UDP 50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 68 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK RAck: 1509 14320 INVITE Content-Length: 0

2021/09/21 15:31:18.234281 50.50.50.210:5060 -> 50.50.50.182:5060 PRACK sip:123456789@200.200.200.209:5060 SIP/2.0 Via: SIP/2.0/UDP 50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3 Via: SIP/2.0/TLS 10.2.1.160:58568 ;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias Max-Forwards: 69 From: "MyUserNAme" <sip:987654321@sip.mydomain.com

...

;tag=73622588a6084d8ba1bca54781e5094d

To: sip:123456789@sip.mydomain.com;tag=gK0d8c9073 Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b CSeq: 14321 PRACK Route: sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 Route: sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1 RAck: 1509 14320 INVITE Content-Length: 0

Any help will be much appreciated.

Kind regards, Angelo

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-- Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - Online Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)

• https://www.asipto.com/sw/kamailio-advanced-training-online/

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Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda Kamailio Advanced Training - Online Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)

• https://www.asipto.com/sw/kamailio-advanced-training-online/

Hello,

good it was sorted out and that you wrote what the solution, so people reading the discussion in the archive know what was the case about.

Cheers, Daniel

On 23.09.21 19:32, Angelo Sipper wrote:

Hi Daniel,

I got a response today from the provider escalation team and they actually confirmed that it was a firewall issue from their side. They were blocking their own BYE to us.... They were expecting traffic from us from one only port (as UDP behavior) and since we were sending from different ports, as TCP does, their SBC was not able to respond to us as their firewall was blocking all other ports.  What can I say.... Anyway we now have this provider in operation. Thank you very much and sorry for the big message for no actual reason regarding the Kamailio.

Kind Regards, Angelo

Στις Τετ, 22 Σεπ 2021 στις 7:00 μ.μ., ο/η Angelo Sipper <sippro97@gmail.com mailto:sippro97@gmail.com> έγραψε:

Hi Daniel,

Provider managed to add the transport=tcp in the contact as you
suggested and call flow was fine but, another issue came up and I
believe it is again TCP that causes this issue.
If our side terminates the call, our Kamailio2 sends the BYE and
it is accepted from the provider side terminating the call correctly.
When the far end terminates the call, providers send a BYE that we
never receive from the provider and our UAC remains on call. If
our UAC terminates the call after the far end terminates the call
we receive a 481 from the provider as the call actually does not
exist any more on his side and this makes sense.
Even this is not the case, to be 100% sure we have even completely
disabled our firewall on the tests but we have the same results.
Below I am sending you the provider trace that he sends 2 BYE to
us without any response from us. These two BYE never reached our side.
For testing we even changed the TCP listen port of kamailio to
5080 to be separate ports from the UDP which remains on 5060
Provider engineers cannot respond to this problem with a resolution. 
Can you please check if you can see something in the trace that
can identify the cause of this behavior?
Is it something I can change on our Kamailio2 config to avoid this?

TRACE
======
INVITE sip:123456789@sip.mydomain.com:5060
<http://sip:123456789@sip.mydomain.com:5060> SIP/2.0
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0
Max-Forwards: 68
From: 987654321 <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11769 INVITE
Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE,
NOTIFY, REFER, MESSAGE, OPTIONS
Supported: replaces, 100rel, timer, norefersub
Session-Expires: 1800
Min-SE: 90
Content-Type: application/sdp
Content-Length: 324
P-Asserted-Identity: <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>
Contact:
<sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp>
v=0
o=- 3841298833 3841298833 IN IP4 50.50.50.184
s=pjmedia
b=AS:84
t=0 0
a=X-nat:0
m=audio 27892 RTP/AVP 8 0 101
c=IN IP4 50.50.50.184
b=TIAS:64000
a=ssrc:83234588 cname:6b760b5029f225e8
a=rtpmap:8 PCMA/8000
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=sendrecv
a=rtcp:27893


>--- SEND ----------->-------------> [Message: 2 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:16.00120

SIP/2.0 183 Session Progress
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0
From: 987654321 <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11769 INVITE
Contact: <sip:123456789@200.200.200.209:5060;transport=tcp>
Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
Require: 100rel
RSeq: 6618
Content-Length: 242
Content-Disposition: session; handling=required
Content-Type: application/sdp
v=0
o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209
s=SIP Media Capabilities
c=IN IP4 200.200.200.211
t=0 0
m=audio 27992 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=maxptime:20


<--- RECV -----------<-------------< [Message: 3 of 12 ]
<------------<------------<

Date: 09-22-2021 Time: 08:27:17.00047

PRACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bKdd1.b4a7f8fbbf8027cc1b0a457f9e5963f7.0
Max-Forwards: 68
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11770 PRACK
RAck: 6618 11769 INVITE
Content-Length: 0
Contact:
<sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp>


>--- SEND ----------->-------------> [Message: 4 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:17.00050

SIP/2.0 200 OK
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bKdd1.b4a7f8fbbf8027cc1b0a457f9e5963f7.0
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11770 PRACK
Content-Length: 0


>--- SEND ----------->-------------> [Message: 5 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:17.00053

SIP/2.0 183 Session Progress
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0
From: 987654321 <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11769 INVITE
Require: 100rel
RSeq: 6619
Contact: <sip:123456789@200.200.200.209:5060;transport=tcp>
Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
Content-Length: 242
Content-Disposition: session; handling=required
Content-Type: application/sdp
v=0
o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209
s=SIP Media Capabilities
c=IN IP4 200.200.200.211
t=0 0
m=audio 27992 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=maxptime:20


<--- RECV -----------<-------------< [Message: 6 of 12 ]
<------------<------------<

Date: 09-22-2021 Time: 08:27:17.00059

PRACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bKed1.fd8ecce909458a05324665afccdde954.0
Max-Forwards: 68
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11771 PRACK
RAck: 6619 11769 INVITE
Content-Length: 0
Contact:
<sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp>


>--- SEND ----------->-------------> [Message: 7 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:17.00062

SIP/2.0 200 OK
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bKed1.fd8ecce909458a05324665afccdde954.0
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11771 PRACK
Content-Length: 0


>--- SEND ----------->-------------> [Message: 8 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:20.00083

SIP/2.0 200 OK
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bK4e1.3a5eafdb0c6cb4f6b4fbaf7faface967.0
From: 987654321 <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11769 INVITE
Accept: application/sdp, application/isup, application/dtmf,
application/dtmf-relay, multipart/mixed
Contact: <sip:123456789@200.200.200.209:5060;transport=tcp>
Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
P-Asserted-Identity: <sip:6932489919@MOBILE.PROVIDER.COM
<mailto:sip%3A6932489919@MOBILE.PROVIDER.COM>;user=phone>
Require: timer
Supported: timer
Session-Expires: 1800;refresher=uas
Content-Length: 242
Content-Disposition: session; handling=required
Content-Type: application/sdp
v=0
o=Sonus_UAC 21561 25962 IN IP4 200.200.200.209
s=SIP Media Capabilities
c=IN IP4 200.200.200.211
t=0 0
m=audio 27992 RTP/AVP 8 101
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=sendrecv
a=maxptime:20


<--- RECV -----------<-------------< [Message: 9 of 12 ]
<------------<------------<

Date: 09-22-2021 Time: 08:27:20.00102

ACK sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bK4e1.d06307f54416ad3db79569f704d8658e.0
Max-Forwards: 68
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11769 ACK
Content-Length: 0
Contact:
<sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp>


>--- SEND ----------->-------------> [Message: 10 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:26.00061

BYE sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp
SIP/2.0
Via: SIP/2.0/TCP
200.200.200.209:5060;branch=z9hG4bK0dB7cb270586eb0337b
From: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
To: "987654321" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 9423 BYE
Max-Forwards: 70
Supported: 100rel
Content-Length: 0


>--- SEND ----------->-------------> [Message: 11 of 12 ]
>------------>------------>

Date: 09-22-2021 Time: 08:27:32.00010

BYE sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp
SIP/2.0
Via: SIP/2.0/TCP
200.200.200.209:5060;branch=z9hG4bK0dB7cb270586eb0337b
From: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
To: "987654321" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 9423 BYE
Max-Forwards: 70
Supported: 100rel
Content-Length: 0


<--- RECV -----------<-------------< [Message: 12 of 12 ]
<------------<------------<

Date: 09-22-2021 Time: 08:27:33.00021

BYE sip:123456789@200.200.200.209:5060;transport=tcp SIP/2.0
Via: SIP/2.0/TCP
50.50.50.182:5080;branch=z9hG4bKbd1.38c5755274f4163db0542d5ec9549053.0
Max-Forwards: 68
From: "MyUserName" <sip:987654321@sip.mydomain.com
<mailto:sip%3A987654321@sip.mydomain.com>>;tag=b695280bab3644b78ac5e09a5dba5ac4
To: <sip:123456789@sip.mydomain.com
<mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0df944e5
Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
CSeq: 11772 BYE
User-Agent: MicroSIP/3.20.5
Content-Length: 0
Contact:
<sip:btpsh-b6-614ae8ae-21085-1@50.50.50.182:5080;transport=tcp>

Kind regards,
Angelo

Στις Τετ, 22 Σεπ 2021 στις 9:12 π.μ., ο/η Daniel-Constantin Mierla
<miconda@gmail.com <mailto:miconda@gmail.com>> έγραψε:

    Hello,

    On 21.09.21 16:55, Angelo Sipper wrote:

...

    Hi Daniel,

    Thank you for your prompt response!

    I sent the wrong trace with the added transport=tcp test. Yes
    we tried to add the transport=tcp on config to overcome this
    issue but it was not resolved. I will contact the provider to
    ask them to add the transport on their 183 and I believe it
    will resolve the issue.
    In case they cannot do this is there an alternative to bypass
    this?

    you have the flexibility to set the transport to $du or $ru
    and then relay. Or look at tm module, there are functions that
    can enforce a specific transport layer. Solutions can be made
    in config, but the best would be that the provider fixes it,
    otherwise you have to make a more complex config file to
    figure out if you have to enforce the transport manually or
    not, assuming you route calls to other endpoints that set the
    proper transport value.

    Cheers,
    Daniel

...

    As per now we have the save issue also on our ACK and BYE
    replies we send to the provider which is logical.

    Kind regards,
    Angelo

    Στις Τρί, 21 Σεπ 2021 στις 5:03 μ.μ., ο/η Daniel-Constantin
    Mierla <miconda@gmail.com <mailto:miconda@gmail.com>> έγραψε:

        Hello,

        the contact of the 183 has no transport parameter, which
        means it is the default one, respectively UDP. If the
        Provider wants traffic over TCP, the contact has to be
        with that transport parameter.

        I see that incoming PRACK has R-URI without transport
        parameter, but the one to be forwarded has a malformed
        version where transport=tcp is misplaced, probably due to
        a wrong config operation. If you do it in kamailio.cfg,
        you have to append ";transport=tcp" to $ru (whole r-uri),
        not to $rU (only user part of r-uri).

        Cheers,
        Daniel

        On 21.09.21 15:29, Angelo Sipper wrote:

...

        Correction 
        UAC (OverTLS) ->(TLS)Kamailio1(UDP)->
        (UDP)Kamailio2(TCP)-> (TCP)Provider

        Στις Τρί, 21 Σεπ 2021 στις 4:28 μ.μ., ο/η Angelo Sipper
        <sippro97@gmail.com <mailto:sippro97@gmail.com>> έγραψε:

            Hello,

            We have the following setup and I am having trouble
            passing the PRACK with correct protocol to the provider.

            UAC (OverTLS) ->(UDP)Kamailio1 (UDP)->
            (UDP)Kamailio2 (TCP)-> (TCP)Provider

            UAC : 10.2.1.160 NATED to 100.100.100.61
            <http://50.50.50.50:5065/> (TLS)
            Kamailio1 Sockets: 50.50.50.210:5061
            <http://170.170.170.210:5061/> (TLS),50.50.50.210:5060
            <http://170.170.170.210:5060/> (UDP)
            Kamailio2 Sockets: 50.50.50.182:5060
            <http://170.170.170.170:5060/> (UDP)
            50.50.50.182:5080 <http://170.170.170.170:5060/> (TCP)
            Provider: 200.200.200.209:5060
            <http://200.200.200.193:5060/> (TCP)

            We use dispatcher on Kamailio1 & Kamailio2
            The invite goes fine from UCA up to the provider and
            the provider responses arrive to UAC fine.
            The PRACK from UAC to kamailio1 goes fine to
            Kamaili02 but, Kamailio2 uses the UDP socket to send
            to the provider so the PRACK does not arrive to the
            provider and the call is canceled.
            If the provider is on UDP everything works fine.

            Below I have the trace. What should I look for in
            the config to resolve this wrong protocol/socket on
            the PRACK?

            Kamailio2 Details:

            Sockets
            ======
            listen=udp:50.50.50.182:5060 <http://50.50.50.182:5060>
            listen=tcp: 50.50.50.182:5080 <http://50.50.50.182:5080>

            On the rr module I have
            ==================
            modparam("rr", "enable_double_rr", 1)
            modparam("rr", "append_fromtag", 1)
            modparam("rr", "enable_full_lr", 1)

            CONFIG REQINIT & WITHINDLG PARTS
            ================================
            route[REQINIT] {

            set_reply_no_connect();
            force_rport();

            if (!mf_process_maxfwd_header("10")) {
            xlog("L_ERROR","Too Many Hops Rejecting!");
            sl_send_reply("483","Too Many Hops");
            exit;
            }

            if(is_method("OPTIONS") && uri==myself && $rU==$null) {
            sl_send_reply("200","Keepalive");
            exit;
            }

            if(!sanity_check("1511", "7")) {
            xlog("Malformed SIP message from $si:$sp sanity
            1511\n");
            exit;
            }

            if(!sanity_check("17895", "7")) {
            xlog("Malformed SIP request from $si:$sp sanity
            17895\n");
            exit;
            }
            }

            route[WITHINDLG] {
            if (!has_totag()) return;

            if (loose_route()) {

            if (is_method("BYE")) {
            rtpengine_query();
            rtpengine_delete();
            }
            route(RELAY_OUT);
            }

            if ( is_method("ACK") ) {
            #if (t_lookup_request()) {
            if (t_check_trans()) {
            route(RELAY_OUT);
            exit;
            } else {
            # ACK without matching transaction ... ignore and
            discard
            exit;
            }
            }

            sl_send_reply("404","Not Allowed");
            exit;
            }

            TRACE
            ======
                       50.50.50.210:5060
            <http://50.50.50.210:5060>            
            50.50.50.182:5060 <http://50.50.50.182:5060>        
                50.50.50.182:32818 <http://50.50.50.182:32818>  
                    200.200.200.209:5060
            <http://200.200.200.209:5060>
                      qqqqqqqqqqwqqqqqqq          
             qqqqqqqqqqwqqqqqqq            qqqqqqqqqqwqqqqqqqq  
                   qqqqqqqqqqqwqqqqqqqqq
            a 15:31:11.787490   x        INVITE (SDP)         x
                                        x                      
                  x
            a       +0.003099   x qqqqqqqqqqqqqqqqqqqqqqqqqq> x
                                        x                      
                  x
            a 15:31:11.790589   x  100 trying -- your call is x
                                        x                      
                  x
            a       +0.002220   x <qqqqqqqqqqqqqqqqqqqqqqqqqq x
                                        x                      
                  x
            a 15:31:11.792809   x                             x
                                        x        INVITE (SDP)  
                  x
            a       +0.020725   x                             x
                                        x
            qqqqqqqqqqqqqqqqqqqqqqqqqq> x
            a 15:31:11.813534   x                             x
                                        x         100 Trying    
                 x
            a       +2.628884   x                             x
                                        x
            <qqqqqqqqqqqqqqqqqqqqqqqqqq x
            a 15:31:14.442418   x                             x
                                        x  183 Session Progress
            (SDP) x
            a       +0.001572   x                             x
                                        x
            <qqqqqqqqqqqqqqqqqqqqqqqqqq x
            a 15:31:14.443990   x  183 Session Progress (SDP) x
                                        x                      
                  x
            a       +0.299221   x <qqqqqqqqqqqqqqqqqqqqqqqqqq x
                                        x                      
                  x
            a 15:31:14.743211   x            PRACK            x
                                        x                      
                  x
            a       +0.043114   x qqqqqqqqqqqqqqqqqqqqqqqqqq> x
                                        x                      
                  x
            a 15:31:14.786325   x                             x
                                      PRACK                    
                  x
            a       +0.448104   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>
            x
            a 15:31:15.234429   x            PRACK            x
                                        x                      
                  x
            a       +0.045697   x qqqqqqqqqqqqqqqqqqqqqqqq>>> x
                                        x                      
                  x
            a 15:31:15.280126   x                             x
                                      PRACK                    
                  x
            a       +0.954153   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            a 15:31:16.234279   x            PRACK            x
                                        x                      
                  x
            a       +0.045832   x qqqqqqqqqqqqqqqqqqqqqqqq>>> x
                                        x                      
                  x
            a 15:31:16.280111   x                             x
                                      PRACK                    
                  x
            a       +1.954170   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            a 15:31:18.234281   x            PRACK            x
                                        x                      
                  x
            a       +0.045839   x qqqqqqqqqqqqqqqqqqqqqqqq>>> x
                                        x                      
                  x
            a 15:31:18.280120   x                             x
                                      PRACK                    
                  x
            a       +1.829676   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            a 15:31:20.109796   x                             x
                                        x  183 Session Progress
            (SDP) x
            a       +0.001460   x                             x
                                        x
            <<<qqqqqqqqqqqqqqqqqqqqqqqq x
            a 15:31:20.111256   x  183 Session Progress (SDP) x
                                        x                      
                  x
            a       +2.123075   x <<<qqqqqqqqqqqqqqqqqqqqqqqq x
                                        x                      
                  x
            a 15:31:22.234331   x            PRACK            x
                                        x                      
                  x
            a       +0.045825   x qqqqqqqqqqqqqqqqqqqqqqqq>>> x
                                        x                      
                  x
            a 15:31:22.280156   x                             x
                                      PRACK                    
                  x
            a       +2.239640   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            a 15:31:24.519796   x                             x
                                        x        486 Busy Here  
                 x
            a       +0.000555   x                             x
                                        x
            <qqqqqqqqqqqqqqqqqqqqqqqqqq x
            a 15:31:24.520351   x                             x
                                        x             ACK      
                  x
            a       +0.008965   x                             x
                                        x
            qqqqqqqqqqqqqqqqqqqqqqqqqq> x
            a 15:31:24.529316   x        486 Busy Here        x
                                        x                      
                  x
            a       +0.000835   x <qqqqqqqqqqqqqqqqqqqqqqqqqq x
                                        x                      
                  x
            a 15:31:24.530151   x             ACK             x
                                        x                      
                  x
            a       +1.704184   x qqqqqqqqqqqqqqqqqqqqqqqqqq> x
                                        x                      
                  x
            a 15:31:26.234335   x            PRACK            x
                                        x                      
                  x
            a       +0.045856   x qqqqqqqqqqqqqqqqqqqqqqqqqq> x
                                        x                      
                  x
            a 15:31:26.280191   x                             x
                                      PRACK                    
                  x
            a       +3.954734   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            a 15:31:30.234925   x            PRACK            x
                                        x                      
                  x
            x       +0.045279   x qqqqqqqqqqqqqqqqqqqqqqqq>>> x
                                        x                      
                  x
            x 15:31:30.280204   x                             x
                                      PRACK                    
                  x
            x       +3.954116   x                             x
            qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq>>>
            x
            x 15:31:34.234320   x            PRACK            x
                                        x                      
                  x    


            2021/09/21 15:31:11.787490 50.50.50.210:5060
            <http://50.50.50.210:5060> -> 50.50.50.182:5060
            <http://50.50.50.182:5060>
            INVITE sip:123456789@sip.mydomain.com:5060
            <http://sip:123456789@sip.mydomain.com:5060> SIP/2.0
            Record-Route:
            <sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Record-Route:
            <sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            Max-Forwards: 69
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>
            Contact: "MyUserNAme"
            <sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3>
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE,
            INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
            Supported: replaces, 100rel, timer, norefersub
            Session-Expires: 1800
            Min-SE: 90
            User-Agent: MicroSIP/3.20.5
            Content-Type: application/sdp
            Content-Length:   326
            P-Asserted-Identity: <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>

            v=0
            o=- 3841227071 3841227071 IN IP4 50.50.50.215
            s=pjmedia
            b=AS:84
            t=0 0
            a=X-nat:0
            m=audio 36448 RTP/AVP 8 0 101
            c=IN IP4 50.50.50.215
            b=TIAS:64000
            a=ssrc:2024148033 cname:4f2468fd611910fa
            a=rtpmap:8 PCMA/8000
            a=rtpmap:0 PCMU/8000
            a=rtpmap:101 telephone-event/8000
            a=fmtp:101 0-16
            a=sendrecv
            a=rtcp:36449


            2021/09/21 15:31:11.790589 50.50.50.182:5060
            <http://50.50.50.182:5060> -> 50.50.50.210:5060
            <http://50.50.50.210:5060>
            SIP/2.0 100 trying -- your call is important to us
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3;rport=5060
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Server: myserver
            Content-Length: 0


            2021/09/21 15:31:11.792809 50.50.50.182:32818
            <http://50.50.50.182:32818> -> 200.200.200.209:5060
            <http://200.200.200.209:5060>
            INVITE sip:123456789@sip.mydomain.com:5060
            <http://sip:123456789@sip.mydomain.com:5060> SIP/2.0
            Record-Route:
            <sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.182;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.210;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Record-Route:
            <sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Via: SIP/2.0/TCP
            50.50.50.182:5080;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            Max-Forwards: 68
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>
            Contact: "MyUserNAme"
            <sip:mycustomerid@10.2.1.160:58568;transport=TLS;ob;alias=100.100.100.61~48572~3>
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE,
            INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
            Supported: replaces, 100rel, timer, norefersub
            Session-Expires: 1800
            Min-SE: 90
            Content-Type: application/sdp
            Content-Length:   326
            P-Asserted-Identity: <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>

            v=0
            o=- 3841227071 3841227071 IN IP4 50.50.50.183
            s=pjmedia
            b=AS:84
            t=0 0
            a=X-nat:0
            m=audio 29308 RTP/AVP 8 0 101
            c=IN IP4 50.50.50.183
            b=TIAS:64000
            a=ssrc:2024148033 cname:4f2468fd611910fa
            a=rtpmap:8 PCMA/8000
            a=rtpmap:0 PCMU/8000
            a=rtpmap:101 telephone-event/8000
            a=fmtp:101 0-16
            a=sendrecv
            a=rtcp:29309


            2021/09/21 15:31:11.813534 200.200.200.209:5060
            <http://200.200.200.209:5060> -> 50.50.50.182:32818
            <http://50.50.50.182:32818>
            SIP/2.0 100 Trying
            Via: SIP/2.0/TCP
            50.50.50.182:5080;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Content-Length: 0


            2021/09/21 15:31:14.442418 200.200.200.209:5060
            <http://200.200.200.209:5060> -> 50.50.50.182:32818
            <http://50.50.50.182:32818>
            SIP/2.0 183 Session Progress
            Via: SIP/2.0/TCP
            50.50.50.182:5080;branch=z9hG4bK37fe.254ecab744d678154779037580c59731.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Record-Route:
            <sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Record-Route:
            <sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Contact: <sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060>>
            Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
            Require: 100rel
            RSeq: 1509
            Content-Length:  241
            Content-Disposition: session; handling=required
            Content-Type: application/sdp

            v=0
            o=Sonus_UAC 12038 7929 IN IP4 200.200.200.209
            s=SIP Media Capabilities
            c=IN IP4 200.200.200.212
            t=0 0
            m=audio 17366 RTP/AVP 8 101
            a=rtpmap:8 PCMA/8000
            a=rtpmap:101 telephone-event/8000
            a=fmtp:101 0-15
            a=sendrecv
            a=maxptime:20


            2021/09/21 15:31:14.443990 50.50.50.182:5060
            <http://50.50.50.182:5060> -> 50.50.50.210:5060
            <http://50.50.50.210:5060>
            SIP/2.0 183 Session Progress
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK37fe.f05cee0feff15d488a12d3758cece7ae.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj472f07568b924214ada83ddfb0fb12b6;alias
            From: 987654321 <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14320 INVITE
            Record-Route:
            <sip:50.50.50.182:5080;transport=tcp;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.182:5060;r2=on;lr=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Record-Route:
            <sip:50.50.50.210:5060;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Record-Route:
            <sip:50.50.50.210:5061;transport=tls;r2=on;lr;ftag=73622588a6084d8ba1bca54781e5094d;vsf=AAAAAFpUAgECBwAABnEBB3ZdWEIAQkVFS0BHX2ljZS5ldQ--;vst=AAAAAAAAAAAKCQ8ABAkHCAYKAgdxQFpGbkJCRktDREFYU1AAV0Qw;did=e8e.bb7;nat=yes>
            Contact: <sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060>>
            Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
            Require: 100rel
            RSeq: 1509
            Content-Length:  253
            Content-Disposition: session; handling=required
            Content-Type: application/sdp

            v=0
            o=Sonus_UAC 12038 7929 IN IP4 50.50.50.183
            s=SIP Media Capabilities
            c=IN IP4 50.50.50.183
            t=0 0
            m=audio 29320 RTP/AVP 8 101
            a=maxptime:20
            a=rtpmap:8 PCMA/8000
            a=rtpmap:101 telephone-event/8000
            a=fmtp:101 0-15
            a=sendrecv
            a=rtcp:29321


            2021/09/21 15:31:14.743211 50.50.50.210:5060
            <http://50.50.50.210:5060> -> 50.50.50.182:5060
            <http://50.50.50.182:5060>
            PRACK sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 69
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            Route:
            <sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Route:
            <sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:14.786325 50.50.50.182:5060
            <http://50.50.50.182:5060> -> 200.200.200.209:5060
            <http://200.200.200.209:5060>
            PRACK
            sip:123456789transport=tcp@200.200.200.209:5060
            <http://tcp@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 68
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:15.234429 50.50.50.210:5060
            <http://50.50.50.210:5060> -> 50.50.50.182:5060
            <http://50.50.50.182:5060>
            PRACK sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 69
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            Route:
            <sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Route:
            <sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:15.280126 50.50.50.182:5060
            <http://50.50.50.182:5060> -> 200.200.200.209:5060
            <http://200.200.200.209:5060>
            PRACK
            sip:123456789transport=tcp@200.200.200.209:5060
            <http://tcp@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 68
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:16.234279 50.50.50.210:5060
            <http://50.50.50.210:5060> -> 50.50.50.182:5060
            <http://50.50.50.182:5060>
            PRACK sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 69
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            Route:
            <sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Route:
            <sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:16.280111 50.50.50.182:5060
            <http://50.50.50.182:5060> -> 200.200.200.209:5060
            <http://200.200.200.209:5060>
            PRACK
            sip:123456789transport=tcp@200.200.200.209:5060
            <http://tcp@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.182;branch=z9hG4bK47fe.3406fe45bb75c3e955b6aa67e53aff58.0
            Via: SIP/2.0/UDP
            50.50.50.210;rport=5060;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 68
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            RAck: 1509 14320 INVITE
            Content-Length:  0


            2021/09/21 15:31:18.234281 50.50.50.210:5060
            <http://50.50.50.210:5060> -> 50.50.50.182:5060
            <http://50.50.50.182:5060>
            PRACK sip:123456789@200.200.200.209:5060
            <http://sip:123456789@200.200.200.209:5060> SIP/2.0
            Via: SIP/2.0/UDP
            50.50.50.210;branch=z9hG4bK47fe.067d9577e9ab3e30e01745a2cf73b7a4.0;i=baa3
            Via: SIP/2.0/TLS
            10.2.1.160:58568;received=100.100.100.61;rport=48572;branch=z9hG4bKPj9ab94c339144428bb7ada63b133f2c12;alias
            Max-Forwards: 69
            From: "MyUserNAme" <sip:987654321@sip.mydomain.com
            <mailto:sip%3A987654321@sip.mydomain.com>>;tag=73622588a6084d8ba1bca54781e5094d
            To: <sip:123456789@sip.mydomain.com
            <mailto:sip%3A123456789@sip.mydomain.com>>;tag=gK0d8c9073
            Call-ID: 846ffb2f076848c5b8edc876fa1c0d9b
            CSeq: 14321 PRACK
            Route:
            <sip:50.50.50.182:5060;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            Route:
            <sip:50.50.50.182:5080;transport=tcp;lr;r2=on;ftag=73622588a6084d8ba1bca54781e5094d;did=e8e.c4d1>
            RAck: 1509 14320 INVITE
            Content-Length:  0

            Any help will be much appreciated.

            Kind regards,
            Angelo


        __________________________________________________________
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        -- 
        Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
        www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
        Kamailio Advanced Training - Online
        Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)
          * https://www.asipto.com/sw/kamailio-advanced-training-online/ <https://www.asipto.com/sw/kamailio-advanced-training-online/>

    -- 
    Daniel-Constantin Mierla -- www.asipto.com <http://www.asipto.com>
    www.twitter.com/miconda <http://www.twitter.com/miconda> -- www.linkedin.com/in/miconda <http://www.linkedin.com/in/miconda>
    Kamailio Advanced Training - Online
    Nov 08-11, 2021 (Europe Timezone) - Nov 22-25, 2021 (America Timezone)
      * https://www.asipto.com/sw/kamailio-advanced-training-online/ <https://www.asipto.com/sw/kamailio-advanced-training-online/>