________________________________________
From: [email protected] 
[[email protected]] On Behalf Of Bucur Marius 
[[email protected]]

When subscribing one's mailbox, through the message-summary event package, the
presentity username is usually the same as the watcher username.
Is a message-summary SUBSCRIBE request without a username in the request URI
valid?
e.g. SUBSCRIBE sip:lists.cs.columbia.edu SIP/2.0 instead of SUBSCRIBE
sip:[email protected] SIP/2.0
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The basic theory is that SUBSCRIBE is like INVITE, in that the "correct" URI to 
subscribe to is the one that gets your request to the desired destination.  In 
the case of message-summary subscriptions, you must ask of your system, "What 
URI should I subscribe to in order to get the message status of user UUU?"  In 
principle, that URI is established by the system and can be any URI within its 
domain.  (URIs outside its domain would route to different systems, and could 
not return the status you seek.)

In practice, the convention seems to be that if you want the message status of 
user UUU in a system, you should subscribe to the URI <sip:UUU@domain>.

Dale

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