[OpenSIPS-Users] RTP Proxy Problem - No Way Audio (RTP Traces Within)

[Nick Khamis]

Hello Everyone,

I am having problem getting RTP packets flowing smoothly. The setup is

NAT Box (192.168.2.1) <-> OpenSIPS/RTPProxy (192.168.2.5) <-> Asterisk
(192.168.2.10)

I know that media is reaching the boxes since I see:

OpenSIPS (192.168.2.5)

0.000000 192.168.2.10 -> 192.168.2.5  UDP 214 Source port: 24454
Destination port: 20198
  0.000099  192.168.2.5 -> 81.201.85.45 UDP 214 Source port: 39810
Destination port: 13272
  0.017956 192.168.2.10 -> 192.168.2.5  UDP 214 Source port: 24454
Destination port: 20198
  0.018028  192.168.2.5 -> 81.201.85.45 UDP 214 Source port: 39810
Destination port: 13272
  0.037760 192.168.2.10 -> 192.168.2.5  UDP 214 Source port: 24454
Destination port: 20198
  0.037814  192.168.2.5 -> 81.201.85.45 UDP 214 Source port: 39810
Destination port: 13272


Asterisk CLI (192.168.2.10)

Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)
Sent RTP P2P packet to 192.168.2.5:20198 (type 00, len 000160)

RTPProxy Messages:

INFO:handle_command: new session
KN74JOEJTRFDVOR3PEH7I5XGBA at 81.201.85.45, tag 86219;1 requested, type
strong
INFO:handle_command: new session on a port 20198 created, tag 86219;1
INFO:handle_command: pre-filling caller's address with 81.201.85.45:13272
INFO:handle_command: lookup on ports 20198/39810, session timer restarted
INFO:handle_command: pre-filling callee's address with 192.168.2.10:24454
INFO:handle_delete: forcefully deleting session 1 on ports 20198/39810
INFO:remove_session: RTP stats: 86 in from callee, 0 in from caller,
86 relayed, 0 dropped
INFO:remove_session: RTCP stats: 0 in from callee, 0 in from caller, 0
relayed, 0 dropped
INFO:remove_session: session on ports 20198/39810 is cleaned up


It says 86 in from callee but we do not even have incoming audio. I'm
pretty sure it's "rtpproxy_offer/answer" issue so bellow is my
configuration:

route[1] {
                xlog("Start Call Route For: [ fu=$fu/ tu=$tu /ru=$ru/
ci=$ci]\n");

                if (has_body("application/sdp")) {
                        xlog("Has SDP: $fu\n");
                        rtpproxy_offer();
                }
}

onreply_route[1] {
        xlog("Reply Route 1: [ fu=$fu/ tu=$tu /ru=$ru/ ci=$ci]\n");
        if (has_body("application/sdp")) {
                xlog("Answering  RTP Proxy: $fu\n");
                rtpproxy_answer();
      }
}

Your help is greatly appreciated,

Nick.