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[Sip] How to operate presence contact list?



Dear All:
For SIP based presence service an end user always needs to create, modify, and delete a contact list, or make such operations on the members
of the list, would you please introduce me your ideas about how to operate and manage user contact lists stored at presence server? Through SIP or HTTP, or whatever else?
And, how to maintain the consistency of a contact list if it is stored at both a user terminal and presence server? 
Thanks!
Sincerely yours, 
Chen Zaifeng
--------------------------------------------------------------------------
Beijing International Switching System Corporation Ltd.
TD/DEW
No. 14 Jiu Xian Qiao Road
Beijing 100016, P. R. China
Tel:  +86-10-8457 1921
Fax: +86-10-6436 7732
E-mail: <mailto:zaifeng.chen@bisc.siemens.com.cn>




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