Hello,

I have the same issue, did you manage to fix it?

==================== tag: snd pid: 9737 process: 6 time: 1614177689.185257 date: Wed Feb 24 14:41:29 2021 proto: tls ipv4 srcip: 1.1.1.1 srcport: 5067 dstip: 52.114.75.24 dstport: 5061 ~~~~~~~~~~~~~~~~~~~~ SIP/2.0 200 OK Via: SIP/2.0/TLS 52.114.75.24:5061;branch=z9hG4bK6b5ac083 Record-Route: sip:fqdn:5067;transport=tls;r2=on;ftag=7a6409ee42ac48a897be110166a2bb0b;lr=on Record-Route: sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr From: Adminsip:+123456789@sip.pstnhub.microsoft.com:5061 ;user=phone;tag=7a6409ee42ac48a897be110166a2bb0b To: sip:+987654321@fqdn:5067;user=phone;tag=as7ae795fd Call-ID: dc62c921f9ad5879b00a74c6bb8a466a CSeq: 1 INVITE Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE Supported: replaces, timer Session-Expires: 1800;refresher=uas Contact: sip:+9876654321@192.168.1.1:5060 Content-Type: application/sdp Require: timer Content-Length: 336 Server: SIP Server

v=0 o=SIP 1094517697 1094517697 IN IP4 1.1.1.1 s=PBX c=IN IP4 1.1.1.1 t=0 0 m=audio 14068 RTP/SAVP 8 0 101 a=rtpmap:8 PCMA/8000 a=rtpmap:0 PCMU/8000 a=rtpmap:101 telephone-event/8000 a=fmtp:101 0-16 a=ptime:20 a=sendrecv a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:GocrDpJ7F/MCwQq9RLJad+K1/bAMplS1HRAB0jo6 |||||||||||||||||||| ====================

On Thu, 11 Feb 2021 at 13:28, Phillman25 Kyriacou phillman25@gmail.com wrote:

Hi Guys

Thanks for all your recommendations.

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.

||||||||||||||||||||

tag: snd pid: 31232 process: 6 time: 1613047849.768857 date: Thu Feb 11 14:50:49 2021 proto: tls ipv4 srcip: 82.102.42.58 srcport: 5061 dstip: 52.114.132.46 dstport: 5061

SIP/2.0 200 OK
Via: SIP/2.0/TLS 52.114.132.46:5061;branch=z9hG4bK4f5c9b66
Record-Route: <sip:sbc.intelligentsupport.eu:5060
;ftag=dcea3c9546914ff8826afca13260da1c;lr=on>
Record-Route: <sip:sbc.intelligentsupport.eu:5061
;transport=tls;ftag=dcea3c9546914ff8826afca13260da1c;lr=on>
Record-Route: <sip:sip-du-a-us.pstnhub.microsoft.com:5061
;transport=tls;lr>
From: Phillip Kyriacou<sip:+35722010058@sip.pstnhub.microsoft.com:5061
;user=phone>;tag=dcea3c9546914ff8826afca13260da1c
To: <sip:+35796552237@sbc.intelligentsupport.eu:5061
;user=phone>;tag=as63d965d3
Call-ID: 43f0f0be2fa05b408c81736dbe392aef
CSeq: 1 INVITE
Server: MediaGW V1.0
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO,
PUBLISH, MESSAGE
Supported: replaces, timer
Session-Expires: 1800;refresher=uas
Contact: <sip:+35796552237@82.102.42.52:5060>
Content-Type: application/sdp
Require: timer
Content-Length: 339

v=0
o=root 601931926 601931926 IN IP4 82.102.42.52
s=ASTERISK
c=IN IP4 82.102.42.52
t=0 0
m=audio 16360 RTP/SAVP 0 8 101
a=crypto:1 AES_CM_128_HMAC_SHA1_80
inline:IyrJsjVV0w5ORJQ3OJB0r8iyRZU+1lMjg4i9vzC2
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=maxptime:150
a=sendrecv
||||||||||||||||||||
====================
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