Negotiation Codec and SIP line Problem

Unanswered Question
Feb 13th, 2008

Hi,I've got a Sip line and I can receive the calls but I cannot take an outgoing call because the line dropped when I answer the other side.

When I take an outgoing call, looking the debug ccsip, I notice that there isn't any codec negotiation.

Can you help me???

I have this problem too.
0 votes
  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Aaron Dhiman Wed, 02/13/2008 - 11:59

It seems that the CODEC negotiation is actually completed, and G.729 is chosen:


o=CiscoSystemsSIP-GW-UserAgent 3428 9294 IN IP4

s=SIP Call

c=IN IP4

t=0 0

m=audio 17290 RTP/AVP 18

c=IN IP4

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=yes


That, in fact, may be the problem. Most scenarios with SIP Trunks on the CM require G.711.


This Discussion