[Users] Scalability in presence notification

[Vincent Luba]

Hi,
 
I need some advices about a design issue. I'm trying to figure out how to
manage my presence information notifications, using RFC 3856.
 
I have a situation in which end-to-end presence management wouldn't be
suitable. 
 
Still I'm wondering if server based presence management is a good idea. My
thought is that it present a scalability issue.
The point is that having the presence server would have to handle every
single SUBSCRIBE & PUBLISH request then sends NOTIFY to every watchers.
 
Is it an efficient way to handle presence in a network with hundreds online
users, everyone having tens of contact on their list.
 
 
Thank you for your comments
 
Luba Vincent
 
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