[SIPPING] question on draft-johnston-sipping-cc-conferencing-00.txt

In this draft the creating of a new conference and the joining of an 
existing conference appear identical.  Given that conference servers may 
host many conferences, and given that collision of selected identifiers 
could occur, is there any way for a user to indicate that they wish to 
connect to an existing conference versus creating a new one?

A value such as "isnew" or "existing" could also permit, in the first case, 
an error indicating that a conference by that name already exists, or in 
the second case, an error indicating that a conference by that name does 
not exist.

The presumption is that you do not want to interrupt an existing conference 
already in progress (case 1) or you do not want to create a conference (and 
pay corresponding charges) as an invitee if the invitor is not present 
(case 2).

Is such a protection covered elsewhere in another draft?

Mike

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