RTP issue on CUBE

[oleh@talkup.com.au]

Hi All

I have the following problem. I'm migrating SIP service from one provider to another. A new trunk is getting registered, the call is coming through, but having troubles with RTP. 

I tried to capture packets and can't see any RTP packet - neither incoming nor outgoing.

The call is not getting dropped - just a silence.

RTP debug show the following

EBG-HQ-VGW1#debug voice rtp
VOIP RTP Default: Inout, Function, Error Call & Software debugging is on
EBG-HQ-VGW1#
000477: Jul 8 22:18:24.483: voip_rtp_get_gccb:Error, no gccb for callID:23504
000478: Jul 8 22:18:24.483: voip_rtp_get_gccb:Error, no gccb for callID:23504
000479: Jul 8 22:18:24.483: voip_rtp_get_gccb:Error, no gccb for callID:23504
000480: Jul 8 22:18:24.483: voip_rtp_get_gccb:Error, no gccb for callID:23504
000481: Jul 8 22:18:24.483: voip_rtp_get_gccb:Error, no gccb for callID:23504
000482: Jul 8 22:18:24.599: voip_rtp_get_gccb:Error, no gccb for callID:23504
000483: Jul 8 22:18:24.601: voip_rtp_get_gccb:Error, no gccb for callID:23504
000484: Jul 8 22:18:24.601: voip_rtp_get_gccb:Error, no gccb for callID:23505
000485: Jul 8 22:18:24.601: //4294967295/xxxxxxxxxxxx/VOIPRTP:():voip_rtp_check
_n_create_dp_session: NULL gccb(0x0) or NULL peer_gccb(0x0) for confID:678
000486: Jul 8 22:18:24.601: //4294967295/xxxxxxxxxxxx/VOIPRTP:():voip_rtp_check
_n_create_dp_session:exit@883
000487: Jul 8 22:18:24.601: voip_rtp_get_gccb:Error, no gccb for callID:23504
000488: Jul 8 22:18:24.601: voip_rtp_get_gccb:Error, no gccb for callID:23505
000489: Jul 8 22:18:24.601: //4294967295/xxxxxxxxxxxx/VOIPRTP:():voip_rtp_check
_n_create_dp_session: NULL gccb(0x0) or NULL peer_gccb(0x0) for confID:678
000490: Jul 8 22:18:24.601: //4294967295/xxxxxxxxxxxx/VOIPRTP:():voip_rtp_check
_n_create_dp_session:exit@883
000491: Jul 8 22:18:24.667: voip_rtp_get_gccb:Error, no gccb for callID:23504
000492: Jul 8 22:18:24.667: voip_rtp_get_gccb:Error, no gccb for callID:23505
000493: Jul 8 22:18:24.667: voip_rtp_get_gccb:Error, no gccb for callID:23504
000494: Jul 8 22:18:24.667: voip_rtp_get_gccb:Error, no gccb for callID:23505
000495: Jul 8 22:18:24.667: voip_rtp_get_gccb:Error, no gccb for callID:23504
000496: Jul 8 22:18:25.113: voip_rtp_get_gccb:Error, no gccb for callID:23504
000497: Jul 8 22:18:25.113: voip_rtp_get_gccb:Error, no gccb for callID:23505

and so on....

[Mohammed al Baqari]

Run the command show call active voice brief after the call starts by 1 min
to see the counters. Also, check if you have an access-list or nat rule on
the CUBE which is dropping incoming rtp packets.

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[TONY SMITH]

Check your SIP debugs (debug ccsip mess) and make sure all the signalling is correct and the call is actually connecting.  In particular check the SDP headers to make sure connection port and IP addresses look correct and the call is going to "a=sendrecv" to indicate two way media flow.