[SIPForum-discussion] Codec selection with SIP

[Yuantao Zhang]

I think Raj is right. For my experience, UAS respects itself more than UAC. UAS will choose one codec according to its own priority. But is there any standard for this? Or just most software engineers prefer this? 


-----Original Message-----
From: Raj Jain [mailto:rj2807 at gmail.com] 
Sent: 2008年5月31日 2:36
To: José Antonio García Flores
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Codec selection with SIP

You've not shown an SDP offer/answer exchange. But, assuming that A is
the offerer and presents g711, g729 (in that order) and that B is the
answerer (that would prefer to have the call setup on g729), then
it'll put g729 *only* in its answer. That way, the agreed upon codec
for the session will be g729.

--
Raj Jain

On Fri, May 30, 2008 at 9:00 AM, José Antonio García Flores
<joseantonio.garcia at corp.ya.com> wrote:
> Hi,
> We want to know how codec is selected in SIP calls, i mean , if A party has
> priority over B party.
> For example:
> A party:
>   codec 1 = g711
>   codec 2 = g729
> B party:
>   codec 1 = g729
>   codec 2= g711
>
> At the end, which codec is selected? -> g711?
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