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

Roman Shpount <roman@telurix.com> Tue, 12 May 2020 21:57 UTC

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From: Roman Shpount <roman@telurix.com>
Date: Tue, 12 May 2020 17:57:10 -0400
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To: Paul Kyzivat <pkyzivat@alum.mit.edu>
Cc: Samir Srivastava <srivastava_samir=40hush.com@dmarc.ietf.org>, SIPCORE <sipcore@ietf.org>, Christer Holmberg <christer.holmberg=40ericsson.com@dmarc.ietf.org>
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Subject: Re: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined
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On Tue, May 12, 2020 at 5:45 PM Paul Kyzivat <pkyzivat@alum.mit.edu> wrote:

> 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.
>
>
SUBSCRIBE/NOTIFY messages have a mandatory built-in dialog expiration
support (Expires/Min-Expires headers), so Session Timer in these message
would be redundant. I've never seen anybody using Session Timers with SIP
Events, but as you have said this can be discussed.

Best Regards,
_____________
Roman Shpount

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