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Re: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined

Paul Kyzivat <pkyzivat@alum.mit.edu> Tue, 12 May 2020 21:45 UTC

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To: Roman Shpount <roman@telurix.com>, Samir Srivastava <srivastava_samir=40hush.com@dmarc.ietf.org>
Cc: SIPCORE <sipcore@ietf.org>, Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>
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From: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Date: Tue, 12 May 2020 17:45:45 -0400
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Subject: Re: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined
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On 5/12/20 5:30 PM, Roman Shpount wrote:
> Samir,
> 
> Most likely Min-SE and Session-Expires headers in  REFER, PUBLISH, 
> MESSAGE would be out of scope for 4028bis. So far there was an agreement 
> to limit the scope of 4028bis to fixing handling of multiple 
> transactions which modify Session-Expiration at the same time and 
> associated race conditions.
> 
> Any other changes would need to go into another RFC.
> 
> P.S. Why would you put Min-SE and Session-Expires into REFER, PUBLISH, 
> MESSAGE? These header fields are only defined for INVITE/UPDATE messages 
> and not applicable for any other messages.

Putting them in *these* messages would be nonsensical because they are 
neither dialog establishing nor dialog refreshing. OTOH, it would make 
perfect sense to use them in SUBSCRIBE/NOTIFY because they *are*. 
Session Timer is about maintaining the dialog. I would think it would be 
equally applicable to these kinds of dialog usages. But that is probably 
deserving of discussion.

	Thanks,
	Paul

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