[OpenSIPS-Users] MS Teams ACK not received.

[Ali Dogan]

Hello Bogdan,

Thanks for response. Actually, problem was something different. I had malformed Server header which made 100 Trying ignored from MS(which MS sending another INVITE from different IP) . I see that Microsoft is very strict with Headers, instead of ignoring the header it was ignoring whole response.

Best Regards,


Ali Dogan
+44(0)3300 88 18 18
alidogan at plan.com
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________________________________
From: Bogdan-Andrei Iancu
Sent: Monday, April 14, 2025 09:57
To: OpenSIPS users mailling list; Ali Dogan
Subject: Re: [OpenSIPS-Users] MS Teams ACK not received.


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Hi Ali,

The ACK is routed to the Contact address in 200 OK. So that Contact you set does not point back to your server - and probably MST is sending the ACK to some other destination.

Regards,

Bogdan-Andrei Iancu

OpenSIPS Founder and Developer
  https://www.opensips-solutions.com<https://www.opensips-solutions.com/>
  https://www.siphub.com<https://www.siphub.com/>

On 08.04.2025 18:03, Ali Dogan wrote:
Hello All,

I'm trying to integrate OpenSIP with MS Teams. I'm using opensips with Topology Hiding module. Therefore, I'm adding FQDN to Contact and but MS Teams still not sending ACK to my 200 OK Shown in below.

Is there anything wrong with my 200Ok I send?

SIP/2.0 200 OK
VIA:  SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd29ef91c
Record-Route:  <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr>
From:  "Ali Dogan" <sip:+<CALLING_PARTY>@sip.pstnhub.microsoft.com:5061;user=phone>;tag=90feae90c00c4745b162d0a69fd532bc
To:  <sip:+<Called_Party>@<MY_DOMAIN>:5061;user=phone>;tag=r4FmDXjKF7amm
Call-ID: 778bfb54c5505df2b350f7c8ac8a6832
CSeq:  1 INVITE
Contact:  <sip:+<Called_Party>@<MY_DOMAIN>:5061;transport=tls;did=98f.cbe7a852>
Accept:  application/sdp
Allow:  INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY
Require:  timer
Supported:  timer, path, replaces
Allow-Events:  talk, hold, conference, refer
Session-Expires:  3600;refresher=uac
Content-Type:  application/sdp
Content-Disposition:  session
Content-Length:  510
X-Warning:  CLI Should be in E164 Format
Remote-Party-ID:  "Called_PARTY" <sip:Called_PARTY@<MY_DOMAIN>>;party=calling;privacy=off;screen=no


Best Regards,
Ali

Ali Dogan​​​​

[plan.com]<http://www.plan.com/>

+44(0)3300 88 18 18<tel:+44(0)3300%2088%2018%2018>

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