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

Alejandro Recarey ar at cyberfonica.com
Tue Aug 4 16:20:36 UTC 2020

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. 

Thanks again!

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