<div dir="ltr"><div>is contact an fqdn ? <br></div><div>If not, look no further. <br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Op di 2 feb. 2021 om 15:06 schreef John Quick <<a href="mailto:john.quick@smartvox.co.uk">john.quick@smartvox.co.uk</a>>:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I am seeing a problem in calls made to MS Teams via OpenSIPS configured as<br>
an SBC.<br>
The usual INVITE, 180, 183, 200 OK sequence looks okay, but the ACK request<br>
is not accepted by MS Teams.<br>
When I say "not accepted", I mean an ACK is sent to the Teams Proxy, but<br>
Teams responds after 30 seconds with BYE, reason is:<br>
"Call Controller timed out while waiting for acknowledgement"<br>
<br>
I am able to compare the sip trace for the failing call with a very similar<br>
call scenario on another Teams system that works.<br>
The only explanation I can suggest is that the UAC did not use the same<br>
value for the To-tag as it received in the 200 OK.<br>
Could this explain why Teams is failing to match it against the previous<br>
dialogue?<br>
<br>
John Quick<br>
Smartvox Limited<br>
Web: <a href="http://www.smartvox.co.uk" rel="noreferrer" target="_blank">www.smartvox.co.uk</a><br>
<br>
<br>
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