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

[Sean Olson <seancolson@yahoo.com>]

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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