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

Christer Holmberg <christer.holmberg@ericsson.com> Mon, 11 May 2020 06:34 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Paul Kyzivat <pkyzivat@alum.mit.edu>, "sipcore@ietf.org" <sipcore@ietf.org>
Thread-Topic: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined
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Date: Mon, 11 May 2020 06:34:34 +0000
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Subject: Re: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined
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Correct. I think the idea to not use tables to begin with, unless there is a very good reason for doing so.

Regards,

Christer

________________________________
From: sipcore <sipcore-bounces@ietf.org> on behalf of Paul Kyzivat <pkyzivat@alum.mit.edu>
Sent: Monday, May 11, 2020 12:57 AM
To: sipcore@ietf.org <sipcore@ietf.org>
Subject: Re: [sipcore] Session Timers (RFC 4028) for REFER, PUBLISH, MESSAGE not defined

On 5/10/20 5:29 PM, Keith Drage wrote:
> I dont know whether we reached something we can formally describe as a
> decision, but the overall opion was that it should be the text that
> should normatively describe what the requirements were for the actions
> in respect of inclusion in messages. If these tables were included, they
> should be clearly described as informative.
>
> Further, the normative text should be adequately worded to encompass the
> understanding what happened when new messages were invented - so rather
> than specifically listing messages, it should probably talk about
> messages that create a dialog, etc.

Thanks Keith! I don't have a clear memory, but what you say is
consistent with my vague recollection.

        Thanks,
        Paul

> Keith
>
>
> On 10/05/2020 17:59, Paul Kyzivat wrote:
>> On 5/10/20 9:12 AM, Samir Srivastava wrote:
>>> Hi,
>>>
>>>    The table mentioned in Section 4 in RFC 4028 does not contain
>>> entries for REFER, PUBLISH and MESSAGE methods Below is the table
>>> from Section 4
>>>
>>>
>>> +---------------+-----+-----+---+---+---+---+---+---+---+---+---+---+
>>>     |     Header |where|proxy|ACK|BYE|CAN|INV|OPT|REG|PRA|UPD|SUB|NOT|
>>> +---------------+-----+-----+---+---+---+---+---+---+---+---+---+---+
>>>     |Session-Expires|  R  | amr | - | - | - | o | - | - | - | o | - |
>>> - |
>>>     |               |     |     |   |   |   |   |   |   |   | |   |   |
>>>     |Session-Expires| 2xx | ar  | - | - | - | o | - | - | - | o | - |
>>> - |
>>>     |               |     |     |   |   |   |   |   |   |   | |   |   |
>>>     |Min-SE         |  R  | amr | - | - | - | o | - | - | - | o | - |
>>> - |
>>>     |               |     |     |   |   |   |   |   |   |   | |   |   |
>>>     |Min-SE         | 422 |     | - | - | - | m | - | - | - | m | - |
>>> - |
>>> +---------------+-----+-----+---+---+---+---+---+---+---+---+---+---+
>>>
>>>    They are not applicable for these, but it would have been better
>>> if it is said categorically.
>>
>> IIRC, quite a long time ago it was decided that this table in 3261 was
>> a bad idea, because it is essentially a summary of normative language
>> in other sections of the document and is necessarily an approximation.
>>
>> After that, other work that updates and extends 3261 has been
>> inconsistent it whether it updates the table or not.
>>
>> What we should be careful of is that the in progress update to session
>> timers is clear, normatively and expositively,  one way or another.
>>
>>     Thanks,
>>     Paul
>>
>> _______________________________________________
>> sipcore mailing list
>> sipcore@ietf.org
>> https://www.ietf.org/mailman/listinfo/sipcore
>
> _______________________________________________
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