<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div><div dir="ltr" data-setdir="false">Hi When ACK is received on Kamailio from PBX t_check_trans() fails. </div><div dir="ltr" data-setdir="false">200 OK sent PBX from Teams and ACK from PBX is provided here.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">What could be the issue.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false"> </div><div>SIP/2.0 200 OK </div><div>FROM: "Ext1"<sip:1102@PBX_IP>;tag=e08f0a03-1120-4e13-b0e2-90d1a027c05f </div><div>TO: <sip:1101@KAM_IP>;tag=e667397cb47c457a860222931e320b41 </div><div>CSEQ: 25772 INVITE </div><div>CALL-ID: a6685754-b402-4a15-82b2-5fb2551e5b58 </div><div>VIA: SIP/2.0/UDP PBX_IP:7790;received=PBX_IP;branch=z9hG4bKPj170912fc-0908-40bb-8248-9f6cb560332d;rport=7790 </div><div>RECORD-ROUTE: <sip:sip-du-a-us.pstnhub.microsoft.com:5061;transport=tls;lr>,<sip:sbc.callsprout.com;transport=tls;ftag=e08f0a03-1120-4e13-b0e2-90d1a027c05f;lr>,<sip:KAM_IP:7790;transport=udp;ftag=e08f0a03-1120-4e13-b0e2-90d1a027c05f;lr> </div><div>CONTACT: <sip:api-du-b-usea.pstnhub.microsoft.com:443;x-i=c825abba-7203-442c-8461-994522d14365;x-c=25f3c2ce3a635971b809dc3be872e51b/s/1/63c9eea743284db99366cabf5f7dcbf5;ias=52.114.132.46~5061~3> </div><div>CONTENT-LENGTH: 353 </div><div>SUPPORTED: timer </div><div>CONTENT-TYPE: application/sdp </div><div>ALLOW: INVITE,ACK,OPTIONS,CANCEL,BYE,NOTIFY </div><div>REQUIRE: timer </div><div>SESSION-EXPIRES: 1800;refresher=uac </div><div>SERVER: Microsoft.PSTNHub.SIPProxy v.2020.11.16.5 i.USEA.5 </div><div>X-Siptrace-Fromip: tls:KAM_IP:7790 </div><div>X-Siptrace-Toip: udp:PBX_IP:7790 </div><div>X-Siptrace-Time: 1606205334 607029 </div><div>X-Siptrace-Method: INVITE </div><div>X-Siptrace-Dir: out</div><div><br></div><div> </div><div>ACK sip:api-du-b-usea.pstnhub.microsoft.com:443;x-i=c825abba-7203-442c-8461-994522d14365;x-c=25f3c2ce3a635971b809dc3be872e51b/s/1/63c9eea743284db99366cabf5f7dcbf5;alias=.114.132.46~5061~3 SIP/2.0 </div><div>Via: SIP/2.0/UDP PBX_IP:7790;rport;branch=z9hG4bKPjaa30c14c-c965-473d-bc49-9f223f9f634c </div><div>From: "Ext1" <sip:1102@PBX_IP>;tag=e08f0a03-1120-4e13-b0e2-90d1a027c05f </div><div>To: <sip:1101@KAM_IP>;tag=e667397cb47c457a860222931e320b41 </div><div>Call-ID: a6685754-b402-4a15-82b2-5fb2551e5b58 </div><div>CSeq: 25772 ACK </div><div>Route: <sip:KAM_IP:7790;lr;ftag=e08f0a03-1120-4e13-b0e2-90d1a027c05f> </div><div>Route: <sip:sbc.callsprout.com;transport=tls;lr;ftag=e08f0a03-1120-4e13-b0e2-90d1a027c05f> </div><div>Route: <sip:sip-du-a-us.pstnhub.microsoft.com:5061;transport=tls;lr> </div><div>Max-Forwards: 70 </div><div>User-Agent: Asterisk </div><div>Content-Length: 0 </div><div>X-Siptrace-Fromip: udp:PBX_IP:7790 </div><div>X-Siptrace-Toip: udp:KAM_IP:7790 </div><div>X-Siptrace-Time: 1606205334 615495 </div><div>X-Siptrace-Method: ACK </div><div dir="ltr" data-setdir="false">X-Siptrace-Dir: in </div></div></div></div></body></html>