Re: [Sip] Re: [Simple] -05 MESSAGE and Expires header

["Vijay K. Gurbani" <vkg@lucent.com>]

Sean Olson wrote:
> I fail to see why Expires: 0 means the message
> will never expire. How does 0 equate to infinity?
> 
> An Expires: 0 from the sender, in my opinion,
> should indicate that this message should be delivered
> immediately or not at all. I don't think it should
> be used for the sender (or gateway or proxy) to
> indicate that a message is "stale".

Staleness is what 'Expires: 0' currently implies for REGISTER
and SUBSCRIBE.  And I realize that I am fighting a loosing battle,
but for all it is worth, it will be good to accord only that semantic
to 'Expires: 0', and no more.

Now, before everyone flames me, I do realize that the MESSAGE I-D does
not allow for this behavior, nor are there any requirements in
section 5.4 of RFC 2779 to that effect.  But there have been many
times when I have sent an email which I wish I could retract.  If
in the future we want to do the same for stored IMs (i.e. ones that
elicited a 202 response), we will not be able to use 'Expires: 0' for
this purpose.

- vijay
-- 
Vijay K. Gurbani  vkg@{lucent.com,research.bell-labs.com,acm.org}
Wireless Networks Group/Internet Software and Services
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566     Voice: +1 630 224 0216


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