Please ignore this, we can just check if there is a REQUIRE 100rel header in 
the 18x response 

--- On Sat, 25/6/11, Nauman Sulaiman <nauman762-h...@yahoo.co.uk> wrote:

> From: Nauman Sulaiman <nauman762-h...@yahoo.co.uk>
> Subject: [Sofia-sip-devel] How to know when to send PRACK?
> To: sofia-sip-devel@lists.sourceforge.net
> Date: Saturday, 25 June, 2011, 18:55
> Hi, To use PRACK in our application
> we set 100rel as supported in outgoing INVITE. However to
> know whether to use nua_prack as response to a 18X, 
> does the application have to always check the Require
> header in a 18X to see if it has 100rel or is there some
> other we should be doing it?
> 
> Also if incoming INVITE has 100rel must we check the
> supported header before sending a 18X response reliably? Any
> link to sample code would be useful.
> 
> Thanks
> 
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