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Hello Bogdan,<br>
<br>
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. <br>
<br>
Best Regards,</div>
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<b>From:</b> Bogdan-Andrei Iancu<br>
<b>Sent:</b> Monday, April 14, 2025 09:57<br>
<b>To:</b> OpenSIPS users mailling list; Ali Dogan<br>
<b>Subject:</b> Re: [OpenSIPS-Users] MS Teams ACK not received. </div>
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<div style="font-family: monospace;">Hi Ali,<br>
<br>
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.<br>
<br>
Regards,</div>
<pre><div>Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
<a href="https://www.opensips-solutions.com/" id="OWA2a68daec-3994-6605-0fdd-12caaff09df7" class="x_moz-txt-link-freetext OWAAutoLink" originalsrc="https://www.opensips-solutions.com/" data-auth="NotApplicable">https://www.opensips-solutions.com</a>
<a href="https://www.siphub.com/" id="OWAc611f65d-2b5f-462a-8154-b9a318c98506" class="x_moz-txt-link-freetext OWAAutoLink" originalsrc="https://www.siphub.com/" data-auth="NotApplicable">https://www.siphub.com</a></div></pre>
<div>On 08.04.2025 18:03, Ali Dogan wrote:</div>
<blockquote>
<div 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</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
VIA: SIP/2.0/TLS 52.114.76.76:5061;branch=z9hG4bKd29ef91c</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Record-Route: <a href="sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr" id="OWA201c9601-cc09-6da3-0106-bb7986858c34" class="x_moz-txt-link-rfc2396E OWAAutoLink" data-auth="NotApplicable"><sip:sip-du-a-eu.pstnhub.microsoft.com:5061;transport=tls;lr></a></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
From: "Ali Dogan" <<a href="sip:+" id="OWAc780b73a-792d-5ecd-3943-2ec1386fef9c" class="x_moz-txt-link-freetext OWAAutoLink" data-auth="NotApplicable">sip:+</a><CALLING_PARTY>@sip.pstnhub.microsoft.com:5061;user=phone>;tag=90feae90c00c4745b162d0a69fd532bc</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
To: <<a href="sip:+" id="OWAade50c20-8a62-e2f7-999f-5e185e576cc3" class="x_moz-txt-link-freetext OWAAutoLink" data-auth="NotApplicable">sip:+</a><Called_Party>@<MY_DOMAIN>:5061;user=phone>;tag=r4FmDXjKF7amm</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Call-ID: 778bfb54c5505df2b350f7c8ac8a6832</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
CSeq: 1 INVITE</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Contact: <<a href="sip:+" id="OWAfc7e80d3-b5db-f7a7-a635-fe90d7ef42d4" class="x_moz-txt-link-freetext OWAAutoLink" data-auth="NotApplicable">sip:+</a><Called_Party>@<MY_DOMAIN>:5061;transport=tls;did=98f.cbe7a852></div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Accept: application/sdp</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Allow: INVITE, ACK, BYE, CANCEL, OPTIONS, MESSAGE, INFO, UPDATE, REGISTER, REFER, NOTIFY</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Require: timer</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Supported: timer, path, replaces</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Allow-Events: talk, hold, conference, refer</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Session-Expires: 3600;refresher=uac</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Content-Type: application/sdp</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Content-Disposition: session</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Content-Length: 510</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
X-Warning: CLI Should be in E164 Format</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Remote-Party-ID: "Called_PARTY" <<a href="sip:Called_PARTY@" id="OWA0bd9a3f7-ac25-cd29-7c96-ecc9563ddb06" class="x_moz-txt-link-freetext OWAAutoLink" data-auth="NotApplicable">sip:Called_PARTY@</a><MY_DOMAIN>>;party=calling;privacy=off;screen=no</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
<br>
Best Regards,</div>
<div style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Ali</div>
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<span style="font-family: Verdana; font-size: 9.33px;"><a href="http://www.plan.com/" id="OWAaa36c7db-7c68-0fa2-989a-aeb81e7db4af" class="OWAAutoLink" title="http://www.plan.com/" originalsrc="http://www.plan.com/" data-auth="NotApplicable" style="color: rgb(175, 179, 194); text-decoration: none; margin-top: 0px; margin-bottom: 0px;">plan.com</a> is
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