Re: [SR-Users] Very inconsistent calls

But very often a call will stay up indefinitely! This is what is strange. -----Original Message----- From: sr-users [mailto:sr-users-bounces@lists.kamailio.org] On Behalf Of Michael Young Sent: Sunday, February 11, 2018 9:07 PM To: 'Kamailio (SER) - Users Mailing List' <sr-users(a)lists.kamailio.org> Subject: Re: [SR-Users] Very inconsistent calls And just to add to Alex's comment -- in my experience this is almost always a firewall issue. Whenever I see a call drop in 32 seconds, it is usually because a firewall did not allow the ACK through. Google "Asterisk drops calls after 32 seconds" and you get 1,180,000 results... and the problem is not Asterisk itself. Michael -----Original Message----- From: sr-users [mailto:sr-users-bounces@lists.kamailio.org] On Behalf Of Alex Balashov Sent: Sunday, February 11, 2018 7:27 PM To: Kamailio (SER) - Users Mailing List <sr-users(a)lists.kamailio.org> Subject: Re: [SR-Users] Very inconsistent calls It is hard to speculate without a capture, and indeed there are lots of moving parts with WebRTC. However, the typical reason why an established call would drop after ~30 sec (32, to be precise) is that the end-to-end ACK from the caller, which completes the required "three-way handshake" for call establishment, does not reach the callee. This is because it's not constructed correctly by the calling UA, not routed correctly by intermediate entities, or isn't sent at all by the calling UA. -- Alex Balashov | Principal | Evariste Systems LLC Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free) Web: http://www.evaristesys.com/, http://www.csrpswitch.com/ _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users _______________________________________________ Kamailio (SER) - Users Mailing List sr-users(a)lists.kamailio.org https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users