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List:       sip-implementors
Subject:    RE: [Sip-implementors] clarification regarding no ACK at UAS
From:       Jonathan Rosenberg <jdrosen () dynamicsoft ! com>
Date:       2001-06-26 4:44:09
Message-ID: B65B4F8437968F488A01A940B21982BF0128C746 () DYN-EXCH-001 ! dynamicsoft ! com
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> -----Original Message-----
> From: Paul Kyzivat [mailto:pkyzivat@cisco.com]
> Sent: Monday, June 25, 2001 5:55 PM
> To: Jonathan Rosenberg
> Cc: 'Ranjit Avasarala'; Harpreet Ahluwalia;
> sip-implementors@cs.columbia.edu
> Subject: Re: [Sip-implementors] clarification regarding no ACK at UAS
> 
> 
> I have a related question - what should happen if the UAS fails to
> receive the ACK on a re-INVITE?

Good question.

> 
> In theory, it is the re-INVITE that has failed, so the call should
> revert to the prior state. But that doesn't work because the 
> UAC doesn't
> know there is a problem.

Correct.

> 
> So am I right is assuming that the UAS ought to send a BYE in 
> this case
> as well?

I think the better approach would be to force a state sync by doing a
re-INVITE, rather than hanging up.

Not clear that will help either, of course... if the ACK is totally lost,
probably something bad has happened in the network and nothing will get
through.
 
-Jonathan R.

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

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