[OpenSIPS-Users] Ack without To tag

John Nash john.nash778 at gmail.com
Thu Jun 25 05:25:50 CEST 2015

Let me add some more details which I noticed.

As i explained in previous post in the same subject, we receive ACK without
to tag from one UA, since it will not match any dialog, I tried to route it
to destination with topology_hiding but topology hiding used different
branch tag than the 200 OK received (It only replaced .0 with .2). I think
this is happening because I am also using drouting module and UAC which use

I can post trace also if someone wants to have a look.

On Wed, Jun 24, 2015 at 10:06 PM, John Nash <john.nash778 at gmail.com> wrote:

> I am using opensips 2.1 with topology_hiding module. I have an issue only
> with one SIP endpoint. This endpoint sends Ack message (after 200 OK to
> Invite) without any to tag because of that it is not matching with In
> dialog request section.
> Can a UA send ACK without to tag?...If yes any way I can match it with
> ongoing dialog?
> John
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