[SR-Users] PRACK with UDP to TCP translation send over wrong protocol

Angelo Sipper sippro97 at gmail.com
Thu Sep 23 19:32:00 CEST 2021


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 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at sip.mydomain.com>
> Contact: <sip:btpsh-b6-614ae8ae-21085-1 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at sip.mydomain.com>;tag=gK0df944e5
> Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
> CSeq: 11769 INVITE
> Contact: <sip:123456789 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at sip.mydomain.com>;tag=gK0df944e5
> Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
> CSeq: 11769 INVITE
> Require: 100rel
> RSeq: 6619
> Contact: <sip:123456789 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at 200.200.200.209:5060;transport=tcp>
> Allow: INVITE,ACK,CANCEL,BYE,INFO,PRACK,UPDATE,OPTIONS
> P-Asserted-Identity: <sip:6932489919 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at sip.mydomain.com>;tag=gK0df944e5
> Call-ID: d7ecb3b2408a466ea3074d1b48499bfa
> CSeq: 11769 ACK
> Content-Length: 0
> Contact: <sip:btpsh-b6-614ae8ae-21085-1 at 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 at 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 at sip.mydomain.com>;tag=gK0df944e5
> To: "987654321" <sip:987654321 at 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 at 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 at sip.mydomain.com>;tag=gK0df944e5
> To: "987654321" <sip:987654321 at 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 at 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 at sip.mydomain.com
> >;tag=b695280bab3644b78ac5e09a5dba5ac4
> To: <sip:123456789 at 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 at 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 at 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 at 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 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at sip.mydomain.com>
>>>> Contact: "MyUserNAme"
>>>> <sip:mycustomerid at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at sip.mydomain.com>
>>>> Contact: "MyUserNAme"
>>>> <sip:mycustomerid at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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 at 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 at sip.mydomain.com
>>>> >;tag=73622588a6084d8ba1bca54781e5094d
>>>> To: <sip:123456789 at 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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>>> 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/
>>>
>>> --
>> 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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