[sr-dev] rtpengine SDP duplication

[Alex Balashov]

Hello,

I'm running the latest Kamailio 4.1 branch and 
rtpengine:master:15640991d7fc9d398749f77460b821296cccdcb6, and am 
running into a curious issue where the SDP body is duplicated (included 
twice) on a second branch.

The scenario is that call goes out on branch #1 and an 
rtpproxy_offer("ow-") is made. That branch fails with a 503 and another 
branch goes out with the same offer to a different destination.

The original SDP offer on branch #1:

v=0
o=Sansay-VSXi 188 1 IN IP4 rtpengine
s=Session Controller
c=IN IP4 rtpengine
t=0 0
m=audio 32816 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=rtcp:32817

The SDP offer on branch #2 ends up being:

v=0
o=Sansay-VSXi 188 1 IN IP4 rtpengine
s=Session Controller
c=IN IP4 rtpengine
t=0 0
m=audio 32816 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=rtcp:32817
v=0
o=Sansay-VSXi 188 1 IN IP4 rtpengine
s=Session Controller
c=IN IP4 rtpengine
t=0 0
m=audio 32816 RTP/AVP 0 101
a=rtpmap:0 PCMU/8000
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-16
a=ptime:20
a=sendrecv
a=rtcp:32817

Interestingly enough, this seems to be premeditated, because on the 
first one, the Content-Length is 237, and on the second, 434. So, 
something clearly thinks that this is an appropriate thing to do.

If it makes a difference, I'm using two rtpengines RR'd in a set.

I am unable to reproduce this in my development environment and am 
unsure as to whether it's something that happens in all circumstances 
where there is such failover, or only intermittently. Still, is there 
any reason why it could be?

Thanks!

-- 
Alex Balashov - Principal
Evariste Systems LLC
Tel: +1-678-954-0670
Web: http://www.evaristesys.com/, http://www.alexbalashov.com/

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