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

[Anthony Orlando]

Yes I agree.  I guess what I am saying is the initial intention of the re-invite.  Of course it is now also used as a keep alive mechanism.  So to be more clear, I have seen cases where a vendor sent a re-invite that was NOT a keep alive, in which no change was made to the SDP.  This is not "illegal" but in my opinion it breaks the spirit of the original intent.

--- On Sat, 1/3/09, Stephen Guo <neuguotd at gmail.com> wrote:
From: Stephen Guo <neuguotd at gmail.com>
Subject: Re: [SIPForum-discussion] How to make Re-Invite without SDP
To: avorlando at yahoo.com
Cc: raghul82 at yahoo.co.uk, "nitin kapoor" <nitinkapoorr at gmail.com>, discussion at sipforum.org
Date: Saturday, January 3, 2009, 8:43 PM

The purpose of the re-INVITE is not only modifying the media characteristics, but also refreshing the SIP sessions as per RFC4028. For the latter aim, the SDP payload is not needed but I am not sure if it is required by other RFCs.


On Sat, Jan 3, 2009 at 8:49 PM, Anthony Orlando <avorlando at yahoo.com> wrote:


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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-- 
M. Ranganathan






      
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-- 
Best Regards,
Stephen




      
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