> In section 5.1.1 "Correlation to logs, calls 
> and terminals" of the draft-ietf-sip-events-00.txt 
> the "TO" tag is required in the responses to 
> SUBSCRIBE requests. In section 5.2.1 it says 
> "the From field of a NOTIFY request MUST 
> contain a tag". The question is "Does the 
> tag in the responses (to SUBSCRIBE) and the 
> tag in the From field of a NOTIFY need to be 
> the same? 

Yes.

> What's the implication/significant of it?"

The sender of the SUBSCRIBE would assume that 
forking of the request had occurred.  It would 
either send a 481 or 200 based upon its support 
of forking for SUBSCRIBE.

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