[SIPForum-discussion] Queries regarding B2BUA & re-INVITE

[M. Ranganathan]

On Sun, Dec 7, 2008 at 1:45 AM, Ashoke Kumar Ghosh
<ashoke.k.ghosh at gmail.com> wrote:
> Hi All,
>
> I have the following queries.
>
> 1. Can somebody guide me what should be the handling of 491 response in
> B2BUA scenario.

Start a timer with seconds specified in the retry-after header of the
response if one exists. After that timer has timed out, retry your
re-INVITE.


>
> 2. How to identify from the re-INVITE message whether it is for session
> modification or health check of active dialog. Is there any way to identify
> this without comparing the entire sdp parameters.

Yes. Look at the session version. This is the second integer in the m=
line of the sdp. If that has not changed, then it can be assumed that
the other end did not change the SDP.

>
> Would appreciate if somebody can guide me.
>
> Best Regards..
>
> *******************************************
> Ashoke Kumar Ghosh
> Mobile : 919324279664
> Email: ashoke.k.ghosh at gmail.com
> *******************************************
>
> _______________________________________________
> This is the SIP Forum discussion mailing list
> TO UNSUBSCRIBE, or edit your delivery options, please visit
> http://sipforum.org/mailman/listinfo/discussion
> Post to the list at discussion at sipforum.org
>
>



-- 
M. Ranganathan