I am seeing a problem in calls made to MS Teams via OpenSIPS configured as an SBC. The usual INVITE, 180, 183, 200 OK sequence looks okay, but the ACK request is not accepted by MS Teams. When I say "not accepted", I mean an ACK is sent to the Teams Proxy, but Teams responds after 30 seconds with BYE, reason is: "Call Controller timed out while waiting for acknowledgement"
I am able to compare the sip trace for the failing call with a very similar call scenario on another Teams system that works. The only explanation I can suggest is that the UAC did not use the same value for the To-tag as it received in the 200 OK. Could this explain why Teams is failing to match it against the previous dialogue? John Quick Smartvox Limited Web: www.smartvox.co.uk _______________________________________________ Users mailing list Users@lists.opensips.org http://lists.opensips.org/cgi-bin/mailman/listinfo/users