[Users] How does Openser Presence Server works?

[li wang]

Dear all,

There is one question for OpenSer Presence module i don't understand.

I see that the Presence server takes action base on the received SIP message 
SUBSCRIBE/PUBLISH, I want to know which stack SIP are u using in Openser?
Because i look around the SIP Servlet API standard, it doesn't contain the 
method like doPublish(), doUpdate(). How do u do to realise the Presence 
module with Openser?

Thanks,

li

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