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

[Krishnamoorthy Srini-A19809]

 Minor correction - I think Ranganathan meant to say "look at the 'o='
line" 

 Ashoke, the 'm=' line carries the port, payload info (though a change
here could indicate the stream definitions have changed ... Per RFC I
think it is the o= line that's suppsoed to tell you the SDP has changed)
- implementations check session-version(o=), media and connection
description (m=, c=) I think ...


--
Srini K


-----Original Message-----
From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of M. Ranganathan
Sent: Monday, December 08, 2008 2:57 PM
To: Ashoke Kumar Ghosh
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] Queries regarding B2BUA & re-INVITE

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
> *******************************************
>
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--
M. Ranganathan
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