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<span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Hello All,<br>
<br>
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. <br>
<br>
Is there anything wrong with my 200Ok I send?<br>
<br>
SIP/2.0 200 OK</span>
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VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd29ef91c</div>
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Record-Route: <sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></div>
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From: "Ali Dogan" <sip:+<CALLING_PARTY>@sip.pstnhub.microsoft.com:5061;user=phone>;tag=90feae90c00c4745b162d0a69fd532bc</div>
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To: <sip:+<Called_Party>@<MY_DOMAIN>:5061;user=phone>;tag=r4FmDXjKF7amm</div>
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Call-ID: 778bfb54c5505df2b350f7c8ac8a6832</div>
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CSeq: 1 INVITE</div>
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Contact: <sip:+<Called_Party>@<MY_DOMAIN>:5061;transport=tls;did=98f.cbe7a852></div>
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Accept: application/sdp</div>
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Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY</div>
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Require: timer</div>
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Supported: timer, path, replaces</div>
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Allow-Events: talk, hold, conference, refer</div>
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Session-Expires: 3600;refresher=uac</div>
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Content-Type: application/sdp</div>
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Content-Disposition: session</div>
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Content-Length: 510</div>
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X-Warning: CLI Should be in E164 Format</div>
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Remote-Party-ID: "Called_PARTY" <sip:Called_PARTY@<MY_DOMAIN>>;party=calling;privacy=off;screen=no</div>
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<br>
<br>
Best Regards,</div>
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Ali</div>
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