[SR-Users] RTPengine + kernel module long call RTP drops

[Anthony Joseph Messina]

Recently, I've had to be on a lot of long conference calls and have noticed 
that after about 18-22 minutes, the audio on the call drops out.  There are no 
errors logged from Asterisk, Kamailio, or RTPengine.  The signalling portion 
of the call is unaffected and continues as normal.

My setup is as follows
asterisk-14.3.0-7.gita047b25.fc25.x86_64 (14 branch)
kamailio-5.0.0-5.git2608015.fc25.x86_64 (5.0 branch)
kernel-4.10.8-200.fc25.x86_64 (stable Fedora kernel)
rtpengine-5.1.1.1-9.git27af349.fc25.x86_64 (master branch)
Yealink or Zoiper softphones

Calls are originated as follows using TLS & SRTP
Yealink/Zoiper -> Kamailio/RTPengine+kernel -> Asterisk/DAHDI/PSTN

Related IPtables output below (generated by firewalld)
~]# iptables -S |grep INPUT
-P INPUT ACCEPT
-N INPUT_ZONES
-N INPUT_ZONES_SOURCE
-N INPUT_direct
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j INPUT_direct
-A INPUT -j INPUT_ZONES_SOURCE
-A INPUT -j INPUT_ZONES
-A INPUT -m conntrack --ctstate INVALID -j DROP
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A INPUT_direct -p udp -m udp --dport 30000:40000 -j RTPENGINE --id 0
-A INPUT_ZONES_SOURCE -m set --match-set mss4 src -g IN_mss
-A INPUT_ZONES -g IN_public
-A IN_public -j IN_public_allow
-A IN_public_allow -p udp -m udp --dport 30000:40000 -m conntrack \
   --ctstate NEW -j ACCEPT

I saw https://github.com/sipwise/rtpengine/issues/102 and
https://github.com/sipwise/rtpengine/issues/108, but do not seem to have any 
issues (that I know of) with the SRTP, though the latter ticket references 
"call that would last longer than 20 minutes".

Can you share suggestions for looking into the cause of the audio drops, 
especially as nothing appears in the logs?

Thanks.  -A

-- 
Anthony - https://messinet.com/ - https://messinet.com/~amessina/gallery
F9B6 560E 68EA 037D 8C3D  D1C9 FF31 3BDB D9D8 99B6
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