[SIPForum-discussion] A and B with G.711

[nitin kapoor]

Hello



Whenever your UAC or UAS during the session may decide to change the
 characteristics of the media session.  This is accomplished by   sending a
re-INVITE containing a new media description.  This re-   INVITE references
the existing dialog so that the other party knows  that it is to modify an
existing session instead of establishing a  new session.  The other party
sends a 200 (OK) to accept the change.   The requestor responds to the 200
(OK) with an ACK.



In some case if the other  party does not accept the change, he sends an
error response such as  488 (Not Acceptable Here),
which also receives an ACK.  However, the failure of the re-INVITE does not
cause the existing call to fail -  the session
continues using the previously negotiated.

Please refer to RFC 3261 for more info. Hello



Thanks,

Nitin Kapoor


2009/5/14 Jyothi Laxmish <jyothil at techmahindra.com>

>  Hi all
>
>
>
>     Suppose A and B are in conversation stage with g.711 codec.
>
>      A want to change his codec with g.729 ( any other also)   which B
> supports. In this
>
>    Scenario how A has to communicate with B  in Sip. Whether UPDATE can be
> used? If yes how?
>
>
>
> *Regards,*
>
> *Jyothi *
>
>
>
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