[OpenSIPS-Users] SDP problem

[Simon Gajski]

Hi

We are doing a SIP interconnection with one of carriers that sends us 
Invite with SDP where "c=IN" parameter is defined twice.
v=0 o=- 33593 33593 IN IP4 172.29.1.2 s=- *c=IN IP4 172.29.3.4*t=0 0 
a=sendrecv m=audio 36440 RTP/AVP 8 18 96*c=IN IP4 172.29.3.4*b=RR:0 
b=RS:0 a=rtpmap:8 PCMA/8000 a=rtpmap:18 G729/8000 a=fmtp:18 annexb=yes 
a=rtpmap:96 telephone-event/8000 a=fmtp:96 0-15 a=maxptime:40


We are using opensips 3.4.2 with rtpengine 10.5.0.0 to act as SBC
Problem is that when opensips  forwards such INVITE to next hop, 
rtpengine changes accordinly only second line of 'c' parameter, 
resulting in no media.

I never ran into duplicate line of 'c' param in SDP.

My question: Is it possible to remove one of duplicated lines before 
rtpengine handles it or if anyone knows how to process both lines in 
rtpengine?
Carrier is one of national telcos and won't remove it. So I need to 
figure out how to solve it on our side.

Thank you for any tip

BR
Simon
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