<div dir="ltr">Hi Guys <div><br></div><div>Thanks for all your recommendations.</div><div><br></div><div>I did the change and rr headers only show the fqdn of Kamailio as you can see below in the 200 OK sent back to MS Teams, however still the same issue no ACK.</div><div><br></div><div>||||||||||||||||||||<br>====================<br>tag: snd<br>pid: 31232<br>process: 6<br>time: 1613047849.768857<br>date: Thu Feb 11 14:50:49 2021<br>proto: tls ipv4<br>srcip: 82.102.42.58<br>srcport: 5061<br>dstip: 52.114.132.46<br>dstport: 5061<br>~~~~~~~~~~~~~~~~~~~~<br>SIP/2.0 200 OK<br>Via: SIP/2.0/TLS 52.114.132.46:5061;branch=z9hG4bK4f5c9b66<br>Record-Route: <sip:sbc.intelligentsupport.eu:5060;ftag=dcea3c9546914ff8826afca13260da1c;lr=on><br>Record-Route: <sip:sbc.intelligentsupport.eu:5061;transport=tls;ftag=dcea3c9546914ff8826afca13260da1c;lr=on><br>Record-Route: <sip:sip-du-a-us.pstnhub.microsoft.com:5061;transport=tls;lr><br>From: Phillip Kyriacou<sip:+35722010058@sip.pstnhub.microsoft.com:5061;user=phone>;tag=dcea3c9546914ff8826afca13260da1c<br>To: <sip:+35796552237@sbc.intelligentsupport.eu:5061;user=phone>;tag=as63d965d3<br>Call-ID: 43f0f0be2fa05b408c81736dbe392aef<br>CSeq: 1 INVITE<br>Server: MediaGW V1.0<br>Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE<br>Supported: replaces, timer<br>Session-Expires: 1800;refresher=uas<br>Contact: <<a href="http://sip:+35796552237@82.102.42.52:5060">sip:+35796552237@82.102.42.52:5060</a>><br>Content-Type: application/sdp<br>Require: timer<br>Content-Length: 339<br><br>v=0<br>o=root 601931926 601931926 IN IP4 82.102.42.52<br>s=ASTERISK<br>c=IN IP4 82.102.42.52<br>t=0 0<br>m=audio 16360 RTP/SAVP 0 8 101<br>a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:IyrJsjVV0w5ORJQ3OJB0r8iyRZU+1lMjg4i9vzC2<br>a=rtpmap:0 PCMU/8000<br>a=rtpmap:8 PCMA/8000<br>a=rtpmap:101 telephone-event/8000<br>a=fmtp:101 0-16<br>a=maxptime:150<br>a=sendrecv<br>||||||||||||||||||||<br>====================<br></div></div>