[Freeswitch-users] Freeswitch not replying ACK to some 200 OK messages

mayamatakeshi mayamatakeshi at gmail.com
Tue Aug 4 21:04:32 UTC 2020

On Wed, Aug 5, 2020 at 2:12 AM Alejandro Recarey <ar at cyberfonica.com> wrote:

> Hello everyone!
> I’m having an issue where freeswitch sometimes will not send ACK back to a
> 200 OK message. These are outbound calls made by mod_callcenter, and every
> 64 seconds a RE-INVITE is issued. My UA’s answer with a 200 OK, and most of
> the times, Freeswitch then sends an ACK. However, sometimes the ACK is not
> sent, and this causes the UA to drop the call 30 seconds later.
> At the moment I’m checking on ways to increase the session timers for
> these calls, as all of my UA are WSS connections and thus TCP based, I’m
> not worried about NAT. But sending so many critical REINVITES per call
> means that if something is missed like is happening, the call will drop.
> Has anybody else encountered this issue? I’m running on 1.10.
> I don’t see anything special in the Freeswitch logs.
> Curiously, the header shows `Session-Expires: 120;refresher=uac` but FS is
> refreshing the session every 64 seconds.
> I know its ClueCon now, congrats everyone! I hope someone has encountered
> this before and can point me in the right direction.

Is by any chance FS getting a '180 Ringing' or '183 Session Progress' after
'200 OK'?
I don't know if this issue exists in the latest FS, but I remember seeing
an old FS commit failing to send ACK in such cases.
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