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

[Andrea Puddu]

Hello Guillermo,

look at 

a=fmtp:18 annexb=yes


G729b stands for G729 annexb=yes;
G729a stands for G729 annexa=yes;


Regards,

Andrea

Date: Thu, 25 Sep 2008 18:05:51 -0500
From: Guillermo.Zuniga at cwpanama.com
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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