[OpenSIPS-Users] To-tag value in ACK

Johan De Clercq Johan at democon.be
Tue Feb 2 14:41:54 EST 2021

is contact an fqdn ?
If not, look no further.

Op di 2 feb. 2021 om 15:06 schreef John Quick <john.quick at smartvox.co.uk>:

> 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
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> Users at lists.opensips.org
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