[SIPForum-discussion] Where the CODEC G729A or G729B is define

[Manpreet Singh]

it seems you are trying to send both in the offer but use g729B with payload 18 and 98 for g729a. it seems your carrier doesnt support dynamic payload and hence cant do 98 for g729a. try sending 18 for g729A and 98 for annex B and see if that works.
 
M

________________________________

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Zuñiga, Guillermo
Sent: Thursday, September 25, 2008 7:06 PM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] Where the CODEC G729A or G729B is define



Hi Fellows.


One question I am trying to send send a Call to a specified Carrier and he is telling me that I am sending the INVITE with codec g729b

And he are expecting to receive just g729a, and he can't send me his codec using 183/200OK SDP. 

Seeing into the INVITE where is define that I am sending g279b and not g729a,

 

INVITE sip:29725723244195 at 208.65.92.32:5060;user=phone SIP/2.0

...

...

v=0

o=MG4000|2.0 182208 182208 IN IP4 172.18.75.2

s=-

c=IN IP4 204.2.240.194

t=0 0

m=audio 56952 RTP/AVP 18 98 101 13

a=rtpmap:98 G.729a/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

a=fmtp:18 annexb=yes

a=ptime:10

a=rtpmap:13 CN/8000

 

This line(a=rtpmap:98 G.729a/8000) doesn't mean that I am sending G729A? or is the line {m=audio 56952 RTP/AVP 18 98 101 13} and a=fmtp:18 annexb=yes (b), that means the codec out is (g729b)?

 

Guillermo

 

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