RE: On the need for presence service identifiers

On 20 August 2002 13:16, John D. Ramsdell wrote:
> One way to correctly answer this question is to use the convention 
> that a PRES URI's identifies a presence service if and only if it's 
> local part is the string "notifier".  Of course, there are other 
> conventions that can be used to distinguish presence service 
> identifiers.

And another is to expect that the message is signed by a key associated
with 'pres:[email protected]' where the signature includes the Datetime
header in which case the From address isn't relevant. Either the
presence document signature is valid (and matches the entity attribute)
including the appropriate timestamp so the document is trusted, or it
isn't and it is discarded or whatever.

Adrian.