[Serusers] presence server 2 presence server

[cherami at gmx.de]

Hi,

I am student and new to the Presence Model und Protocols.

I have in my student project the following scenario:

company A wants to develop a presence service PA. The presence service PA 
should get the data from the presence server PB of an other Company B over 
the Internet. The Presence information of PA should be made available in 
the Company A for different applications.

my question: 
can PA poll or subscribe all changed/updated Presence Information from PB 
regularly. Or it should request the Presence Information of each Presentity 
individually?

which Presence server can implement the presence service PA. 
What should I do if PB uses another Protokoll?

Thank you and Best Regards
Koder    
-- 
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