[SIPForum-discussion] Codec selection with SIP

Raj Jain rj2807 at gmail.com
Fri May 30 18:35:50 UTC 2008

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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