[SIPForum-discussion] How to make Re-Invite without SDP

[Moshe Ostrovsky]

Hi,

 

Re-Invite can be used for purpose of session-refresh (triggered by
Session-timer mechanism) and in this situation no SDP is required.

 

Regards, Moshe.

 

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Anthony Orlando
Sent: Saturday, January 03, 2009 2:49 PM
To: raghul82 at yahoo.co.uk; nitin kapoor
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] How to make Re-Invite without SDP

 

This issue has come up for me on a few occasions.  The purpose of the
re-INVITE is to change the media characteristics.  If you send a
re-INVITE without changing anything then it is breaking the spirit of
the RFC, although I can't find anything that says it isn't allowed.

--- On Fri, 1/2/09, nitin kapoor <nitinkapoorr at gmail.com> wrote:

From: nitin kapoor <nitinkapoorr at gmail.com>
Subject: Re: [SIPForum-discussion] How to make Re-Invite without SDP
To: raghul82 at yahoo.co.uk
Cc: discussion at sipforum.org
Date: Friday, January 2, 2009, 8:19 PM

Hello Raghul

Can you please let us know where its shown that "we can send INivite
without SDP" or if you have any docs for the same.

Thanks
Nitin Kapoor



2008/11/17 Raghul Prasanna <raghul82 at yahoo.co.uk>

Hi Ranganathan,

 

 I knew that in an initial call set up we can send INivite without SDP
and in 200 OK we get SDP from the far end and we can ack with SDP...

 

 I didnt know that we can have the same in reinvite..

 

thanks for the info

 

Raghul

--- On Mon, 17/11/08, M. Ranganathan <mranga at gmail.com> wrote:

	From: M. Ranganathan <mranga at gmail.com>
	Subject: Re: [SIPForum-discussion] How to make Re-Invite without
SDP
	To: raghul82 at yahoo.co.uk
	Cc: discussion at sipforum.org, "shiba shankar rout"
<rout.shibashankar at gmail.com>
	Date: Monday, 17 November, 2008, 6:04 PM

	 

	On Mon, Nov 17, 2008 at 10:33 AM, Raghul Prasanna
<raghul82 at yahoo.co.uk>
	
	wrote:
	
	> HI Shiba,
	
	>
	
	>  I dont think we can reinvite without SDP, because the purpose
of reinvite
	
	> is to change the media characteristics of a call after the
call got
	
	> established..
	
	>
	
	>  Please can someone correct if I am wrong...
	
	    
	
	You are corrected.
	
	    
	
	You solicit an SDP offer using a Re-INVITE without SDP. The OK
should
	
	have the SDP offer and you ACK with SDP to complete the 3-way
	
	handshake.
	
	    
	
	>
	
	>   For generating PRACK, the invite shd have supported:100 rel
parameter..
	
	>
	
	> Thanks,
	
	> Raghul
	
	> --- On Sun, 16/11/08, shiba shankar rout
	
	<rout.shibashankar at gmail.com>
	
	> wrote:
	
	>
	
	> From: shiba shankar rout <rout.shibashankar at gmail.com>
	
	> Subject: [SIPForum-discussion] How to make Re-Invite without
SDP
	
	> To: discussion at sipforum.org
	
	> Date: Sunday, 16 November, 2008, 6:24 AM
	
	>
	
	> Hi everyone,
	
	>
	
	> I am not able to make re-invite without SDP. How to make
re-invite without
	
	> SDP & with PRACK.
	
	> Is there any solution to this?
	
	>
	
	> Any hint would be welcome.
	
	>
	
	> Thanks
	
	> S S rout
	
	>
	
	> _______________________________________________
	
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	> _______________________________________________
	
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	>
	
	    
	
	    
	
	    
	
	-- 
	
	M. Ranganathan



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