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I have the exact same problem with my Yeastar S20 PBX: all outgoing calls through the Freephoneline trunk is disconnecting after exactly 15 minutes. Surprisingly, I have another trunk on the same PBX with another SIP provider (voip.ms) and calls never get disconnected. The SIP settings (ex: timeouts) on that PBX are global to all trunks. I tried changing the RTP reinvite and the session timers but nothing worked, calls are still getting disconnected.

I also checked the firewall (pfSense 2.4). There is no ALG running and state table cleanup is set to be Conservative. Whenever the call drops I still see the SIP and RTP entries in the state table for a long time after. So this is clearly not the firewall dropping the NAT state.

Like other people reported it in this discussion, I had a few random call drops before but this situation happenning at every outgoing call really started somewhere in March 2020. Any one has an idea?

intplus wrote:I have the exact same problem

Freepbx/Asterisk users in the thread you originally posted in resolved their issue by using type=peer and canreinvite=no
http://forum.fongo.com/viewtopic.php?f=8&t=19803#p77291
http://forum.fongo.com/viewtopic.php?f= ... =25#p77295

I've split the topic since they've resolved their issue and yours involves Yeastar S20 PBX.

You might want to see if there's a firmware update or newer Asterisk version you can use.

I also checked the firewall (pfSense 2.4). There is no ALG running

pfSense doesn't have a SIP ALG unless you've installed siproxd.
https://sourceforge.net/p/siproxd/discu ... /cb22/314d

and state table cleanup is set to be Conservative

For setting UDP timeouts, refer to https://forums.redflagdeals.com/freepho ... #p30454417

I won't be setting up a PBX to troubleshoot, and I don't have your specific device. If you can't find answers here, or if no one else responds, you can try asking at https://www.dslreports.com/forum/voip.