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

[Sean Olson <seancolson@yahoo.com>]

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".

By stale,
I assume you mean a message that was intended for
immediate delivery, but was actually stored instead
-- this is not something existing SIP headers do a
good job of representing. I wouldn't try to hack
Expires: to fit this. Furthermore, I don't think
this is a problem that the message draft should have
to solve. Until someone comes up with a more complete
draft for offline message retrieval, I think we can
punt this. Or is that what you were offering to do?


--- hisham.khartabil@nokia.com wrote:
> So, a MESSAGE with Expires: 10 means it has 10
> seconds before it's stale while a MESSAGE with
> Expires: 0 means it will never be stale?
> 
> How do u inform the receiver that a message is
> stale?
> 
> /Hisham
> 
> > -----Original Message-----
> > From: ext Sean Olson [mailto:seancolson@yahoo.com]
> > Sent: Monday, July 22, 2002 8:07 PM
> > To: Ben Campbell; Vijay K. Gurbani
> > Cc: Adam Roach; SIP LIST
> > Subject: Re: [Sip] Re: [Simple] -05 MESSAGE and
> Expires header
> > 
> > 
> > So we have three things we might want to 
> > represent:
> > 
> > 1) Priority -- we use the Priority header for this
> > 2) Timeliness of content -- we use Expires: header
> >    for this
> > 3) Urgency -- we don't currently have a way to 
> >    represent this
> > 
> > Obviously 2 & 3 are related but not identical.
> > The message doesn't have to be urgent in order
> > for you to request immediate delivery. I think
> > solving (2) is enough for now. It is the more
> > interesting case for gateways and other
> > intermediaries that have to decide between a 
> > store-and-forward or immediate delivery approach.
> > In other words, stick with what we have today in
> > the draft.
> > 
> > /sean
> > 
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> > 


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