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List:       sip-implementors
Subject:    Re: [Sip-implementors] doubt regarding draft-ietf-sip-100rel-05.txt
From:       Jonathan Rosenberg <jdrosen () dynamicsoft ! com>
Date:       2002-02-27 7:21:04
Message-ID: 3C7C88E0.2C4D9864 () dynamicsoft ! com
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stoshniwal@hss.hns.com wrote:
> 
> Hi all,
> 
> I had a query regarding the latest Reliable Provisional Responses
> draft. The earlier version (that is: 100rel-04, before 100rel made
> its brief visit to the bis-RFC :) had text stating:
> 
> "Since reliable provisional responses MAY contain Record-Route headers
> (if the request was an initial INVITE, for example), the PRACK
> request MUST contain Route headers according to the procedures
> specified in [1], as if the PRACK were a BYE. The Route header that
> is constructed from some provisional response MUST NOT be placed in
> any other request except for a PRACK for all provisional responses
> with the same tag in the To field. For reliable provisional responses
> to a request that contained Route headers, the PRACK MUST contain the
> same Route headers as the request."
> 
> The latest draft is silent with respect to the routing of PRACK(s)
> for a call-leg. My doubts are:
> 
> a. Does this text remain the same now and has been skipped by mistake?
> b. If yes, why does the Route set created by 1xx for a call-leg not
>    hold after the call setup is completed? (Using it only
>    for PRACKs within this call leg seems to indicate this...
>    or am I missing something here?)

PRACK is considered a request within the context of a dialog. This is
explicitly stated in the 100rel draft. Because of that, it is
constructed as would any other request within the dialog. The procedures
for such are defined in bis, and they specify the construction of the
Route headers.

-Jonathan R.
-- 
Jonathan D. Rosenberg, Ph.D.            72 Eagle Rock Avenue
Chief Scientist                         First Floor
dynamicsoft                             East Hanover, NJ 07936
jdrosen@dynamicsoft.com                 FAX: (973) 952-5050
http://www.jdrosen.net                  PH:  (973) 952-5000
http://www.dynamicsoft.com

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