900 seconds is the most common call session renegotiation period, that's when a re-INVITE is sent from one party to the other, which similar to the original INVITE has SDP information in it. If there's something wrong with the re-INVITE, the call may go silent one/both ways either drop, it depends.
General recommendation would be to check SIP traffic at the 15 min mark and analyze the re-INVITE, see if there's anything wrong with it. Cheers, On Thu, Aug 6, 2020 at 2:06 AM ad...@conradit.com <ad...@conradit.com> wrote: > All, hi: > > > > I’m a Kamailio newbie! > > > > I’ve managed to set up a proxy server with the minimal configuration file > found here: > https://github.com/kamailio/kamailio/blob/master/misc/examples/mixed/kamailio-minimal-proxy.cfg > . > > > > The issue that I’m having is that the audio on calls simply stop precisely > after 15 minutes. It’s always precisely at 15 minutes. The calls continue > connected but without any audio. > > > > A summary about my set up: > > > > 1. This is an Amazon AWS EC2 server so it doesn’t have a public IP > directly attached to the interface. This makes me believe that the issue > might be related to NAT. > > 2. I use Flowroute as the SIP trunk for these tests. > > 3. My phone system, for testing purposes, works on UDP port 6060 an > the RTP ports are 20,000 to 30,000. > > 4. I am not using, for the time being, TLS nor SRTP. > > 5. My phone system is inside the same subnet as the Kamailio server. > > > > Questions: > > > > 1) Am I missing the NATHELPER module and if so how could we combine it > to the minimal proxy configuration described above? Assuming that my > Kamailio server uses local IP 10.80.10.5 and the PBX 10.80.10.6, both on > UDP port 6060 for SIP. > > 2) May I simply combine the example file for nathelper.cfg as per this > URL: > https://github.com/kamailio/kamailio/blob/master/misc/examples/mixed/nathelper.cfg > to the proxy example files, change IP addresses, ports, etc.? If not, how > would one go about adding the NATHELPER module to the minimal proxy > configuration? > > 3) Could it be some other issue that is causing the 15-minute > interruption on audio? > > > > Thank you so much for your help! > _______________________________________________ > Kamailio (SER) - Users Mailing List > sr-users@lists.kamailio.org > https://lists.kamailio.org/cgi-bin/mailman/listinfo/sr-users >
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