Negotiation Codec and SIP line Problem

[bagnolini]

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???

[Aaron Dhiman]

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

v=0

o=CiscoSystemsSIP-GW-UserAgent 3428 9294 IN IP4 10.198.129.46

s=SIP Call

c=IN IP4 10.198.129.46

t=0 0

m=audio 17290 RTP/AVP 18

c=IN IP4 10.198.129.46

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=yes

a=ptime:20

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