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[Sip] Complex status info transfer in SIP presence service

Dear All:
I have questions about SIP based presence service:

1.  If a Registar is used to be a source of original presence info, how to transfer complex or multiple status
     info (not only Online and Offline), e.g. Busy, Idle, No Disturb, from Presentity to Registar? Can these
     status info be contained in an extension parameter of Contact header of Register message?
2. How about the solution that no Registar is used and Presentity push presence info directly to Presence 
    Server by sending of NOTIFY message?

Any of your ideas or answers will be highly appreciated! Thanks!

Sincerely yours, 
Chen Zaifeng
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Beijing International Switching System Corporation Ltd.
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Fax: +86-10-6436 7732
E-mail: <mailto:zaifeng.chen@bisc.siemens.com.cn>



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