Hello,

On 10/10/11 6:43 AM, Austin Einter wrote:

If the SIP UA is not behind the NAT, and Kamailio insersts a=nortpproxy:yes in SDP body, can it cause one sided audio.

The a= line should be added only when force_rtp_proxy() is used, which should happen when is a call that involves NAT, unless you call that function for all calls.

Use ngrep on kamailio server to watch traffic on port 5060 and check if the sdp for INVITE and 200 OK have the proper IP addresses -- they should be rtpproxy ip address when invoking force_rtp_proxy().

Cheers,
Daniel

I am using PJSIP as my UA, kamailio 3.1.5 , rtp proxy 1.2.1 as intermediate proxy for signalling and media. In kamailio config, I have enabled WITH_NAT.

On call setup, only one way audio is there. When I looked at SIP messages, the only additional stuff I can see a=nortpproxy and nat=yes in recpord route.

Without kamailio as intermediate proxy, audio is good both way.

So I feel, when I bring up kamailio as intermediate proxy I am doing some mistake configuration wise either at PJSIP UA or in Kamailio.

Has anybody faced this issue previously.

If so please share how can we fix this issue.

Thanks in advance

Austin
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