Hi,

As this draft mentioned, the presence rules may affect the views of the 
resource state. If the presence rules of presentity are modified, all of etags 
for this presentity have to be abandoned. Or the PS has to evaluate whether 
each etag still is valid. 

For filtering, there is similar problem:
http://www1.ietf.org/mail-archive/web/sip/current/msg19724.html

These are difference between HTTP and SIP events framework.

Cheers,
Qian





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