Hi Daniel, thanks for answered to me...

With debug=3 I see that:

kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:610]: parse_msg(): SIP Request:
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:612]: parse_msg(): method: <ACK>
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:614]: parse_msg(): uri: <sip:+34590@FQND:5061;user=phone;transport=tls>
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:616]: parse_msg(): version: <SIP/2.0>
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/parse_addr_spec.c:185]: parse_to_param(): add param: tag=92e2fd8688a9d17b927d9be2f84faa55-8079
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/parse_addr_spec.c:864]: parse_addr_spec(): end of header reached, state=29
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:171]: get_hdr_field(): <TO> [94]; uri=[sip:+34590@FQND:5061;user=phone]
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:174]: get_hdr_field(): to body [<sip:+34590@FQND:5061;user=phone>], to tag [92e2fd8688a9d17b927d9be2f84faa55-8079]
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:152]: get_hdr_field(): cseq <CSEQ>: <1> <ACK>
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/parse_via.c:1303]: parse_via_param(): Found param type 232, <branch> = <z9hG4bKf4784e39>; state=16
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/parse_via.c:2639]: parse_via(): end of header reached, state=5
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:498]: parse_headers(): Via found, flags=2
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:500]: parse_headers(): this is the first via
kamailio[1096]: 9(1109) DEBUG: <core> [core/receive.c:240]: receive_msg(): --- received sip message - request - call-id: [d3649f52dc0057768ec6c18733de8206] - cseq: [1 ACK]
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:185]: get_hdr_field(): content_length=0
kamailio[1096]: 9(1109) DEBUG: <core> [core/parser/msg_parser.c:89]: get_hdr_field(): found end of header
kamailio[1096]: 9(1109) DEBUG: {1 1 ACK d3649f52dc0057768ec6c18733de8206} <core> [core/receive.c:295]: receive_msg(): preparing to run routing scripts...
kamailio[1096]: 9(1109) DEBUG: {1 1 ACK d3649f52dc0057768ec6c18733de8206} sl [sl_funcs.c:397]: sl_filter_ACK(): too late to be a local ACK!

So, I understand that ACK comes from Teams, right? So kamailio routing problem?

Thanks

El mar., 25 ago. 2020 a las 15:32, Daniel-Constantin Mierla (<miconda@gmail.com>) escribió:

Hello,

run with debug=3 in kamailio.cfg and see if the ACK comes to Kamailio, if yes, then some routing issue in kamailio.cfg. If does not come, you will have to check the headers to see if MS Teams expects something else there, typically is about Record-Route domains...

Cheers,
Daniel

On 20.08.20 12:25, sip user wrote:
Hi, I'm connecting Teams with kamailio server. From Kamailio to teams I have no problems, but from teams to Kamailio yes. Drop the call..

With ngrep I see that:

INVITE sip:1005@CLIENT_IP:55766;transport=UDP;rinstance=d47edf336726e940 SIP/2.0.
Record-Route: <sip:FQND_IP;r2=on;lr>.
Record-Route: <sip:FQND_IP:5061;transport=tls;r2=on;lr>.
FROM: "Javier Gonz..lez Mu..oz"<sip:+324@sip.pstnhub.microsoft.com:5061;user=phone>;tag=c17bb1eb7f8649d4a89d8d4a876ac32b.
TO: <sip:+34560@FQND:5061;user=phone>.
CSEQ: 1 INVITE.
CALL-ID: c1364913e582553a9a9c2544c3583b0a.
MAX-FORWARDS: 69.
Via: SIP/2.0/UDP 92.222.217.64;branch=z9hG4bK7bb5.0fbae76a37829205e04279f220a26af2.0;i=a1.
VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd216a55.
RECORD-ROUTE: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>.
CONTACT: <sip:api-du-a-euno.pstnhub.microsoft.com:443;x-i=b0b53fc5-76ef-4619-9a68-13e0a4eea92d;x-c=c1364913e582553a9a9c2544c3583b0a/d/8/6c25eb3789a14bf188ce6b05b5e27891>.
CONTENT-LENGTH: 1091.
MIN-SE: 300.
SUPPORTED: timer.
USER-AGENT: Microsoft.PSTNHub.SIPProxy v.2020.7.31.1 i.EUNO.0.
CONTENT-TYPE: application/sdp.
ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY.
P-ASSERTED-IDENTITY: <tel:+324>,<sip:EMAIL>.
PRIVACY: id.
SESSION-EXPIRES: 3600.
.
v=0.
o=- 165103 0 IN IP4 127.0.0.1.
s=session.
c=IN IP4 52.113.44.8.
b=CT:10000000.
t=0 0.
m=audio 50452 RTP/SAVP 104 9 103 111 18 0 8 97 101 13 118.
c=IN IP4 52.113.44.8.
a=rtcp:50453.
a=ice-ufrag:FZTb.
a=ice-pwd:yD3P7nr+xNq0VYdv7xpB1F+Y.
a=rtcp-mux.
a=candidate:1 1 UDP 2130706431 52.113.44.8 50452 typ srflx raddr 10.0.33.240 rport 50

U CLIENT_IP:55766 -> FQND_IP:5060 #2
SIP/2.0 180 Ringing.
Via: SIP/2.0/UDP FQND_IP;branch=z9hG4bK7bb5.0fbae76a37829205e04279f220a26af2.0;i=a1.
Via: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd216a55.
Record-Route: <sip:FQND_IP;lr;r2=on>.
Record-Route: <sip:FQND_IP:5061;transport=tls;r2=on;lr>.
Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>.
Contact: <sip:1005@CLIENT_IP:55766;transport=UDP;rinstance=d47edf336726e940>.
To: <sip:+34560@FQND:5061;user=phone>;tag=de4e6b45.
From: "Javier Gonz..lez Mu..oz"<sip:+324@sip.pstnhub.microsoft.com:5061;user=phone>;tag=c17bb1eb7f8649d4a89d8d4a876ac32b.
Call-ID: c1364913e582553a9a9c2544c3583b0a.
CSeq: 1 INVITE.
User-Agent: 3CXPhone 6.0.26523.0.
Content-Length: 0.

U CLIENT_IP:55766 -> FQND_IP:5060 #3
SIP/2.0 200 OK.
Via: SIP/2.0/UDP FQND_IP;branch=z9hG4bK7bb5.0fbae76a37829205e04279f220a26af2.0;i=a1.
Via: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd216a55.
Record-Route: <sip:FQND_IP;lr;r2=on>.
Record-Route: <sip:FQND_IP:5061;transport=tls;r2=on;lr>.
Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>.
Contact: <sip:1005@CLIENT_IP:55766;transport=UDP;rinstance=d47edf336726e940>.
To: <sip:+34560@FQND:5061;user=phone>;tag=de4e6b45.
From: "Javier Gonz..lez Mu..oz"<sip:+324@sip.pstnhub.microsoft.com:5061;user=phone>;tag=c17bb1eb7f8649d4a89d8d4a876ac32b.
Call-ID: c1364913e582553a9a9c2544c3583b0a.
CSeq: 1 INVITE.
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE.
Content-Type: application/sdp.
Supported: replaces.
User-Agent: 3CXPhone 6.0.26523.0.
Content-Length: 1067.
.
v=0.
o=3cxVCE 324945090 117647850 IN IP4 .
s=3cxVCE Audio Call.
t=0 0.
m=audio 0 RTP/SAVP 104 9 103 111 18 0 8 97 101 13 118.
c=IN IP4 52.113.44.8.
a=rtpmap:104 SILK/16000.
a=rtpmap:9 G722/8000.
a=rtpmap:103 SILK/8000.
a=rtpmap:111 SIREN/16000.
a=fmtp:111 bitrate=16000.
a=rtpmap:18 G729/8000.
a=fmtp:18 annexb=no.
a=rtpmap:0 PCMU/8000.
a=rtpmap:8 PCMA/8000.
a=rtpmap:97 RED/8000.
a=rtpmap:101 telephone-event/8000.
a=fmtp:101 0-16.
a=rtpmap:13 CN/8000.
a=rtpmap:118 CN/16000.
a=rtcp:50453.
a=ice-ufrag:FZTb.
a=ice-pwd:yD3P7nr+xNq0VYdv7xpB1F+Y.
a=rtcp-mux.
a=candidate:1 1 UDP 213

I never received ACK..

In my configuration:

Kamailio.cfg:

#!KAMAILIO
#!define WITH_TLS

event_route[tm:local-request] {

if(is_method("OPTIONS") && $ru =~ "pstnhub.microsoft.com") {
append_hf("Contact: <sip:FQND:5061;transport=tls>\r\n");
}
xlog("L_INFO", "Sent out tm request: $mb\n");
}

request_route{

remove_hf("Route");
if (is_method("INVITE|SUBSCRIBE")) {
xlog("L_INFO","$fU is trying to call to $rU con valores $tu\n");
$rU="1005";
}

}

What I'm doing wrong?

I don't understand why not received ACK..

Could anyone help me?

Thanks
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