[OpenSIPS-Users] Opensips altering RTP port in SDP??

Bogdan-Andrei Iancu bogdan at voice-system.ro
Mon Dec 6 11:47:54 CET 2010

Hi Nauman,

OpenSIPS by itself does not change the SDP content, only if instructed 
by the config file, by using function from nathelper/mediaproxy 
modules.  Do you use any of them ?


Nauman Sulaiman wrote:
> Hi, using Opensips 1.6.2. I have observed that soemtimes Opensips changes the  RTP port in the SDP description. This is when using Bria Counterpath client with another softphone. It seems to be because the Bria client has an RTP port of 4000 which gets remapped to something higher eg 4100. This then results in one way audio. Are there any reasons that Opensips would alter the  SDP m=audio line. We are using a Netgear router but don't believe this is modifying anything.
> Thanks

Bogdan-Andrei Iancu
OpenSIPS Bootcamp


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