[OpenSIPS-Users] Best way to Integrate Presence with IM in VoIP environment

[duane.larson at gmail.com]

I wanted to get everyones opinion on what they think is the best way to  
implement Presence with an IM client. Is it possible to do the following

Use SIP for VoIP (obviously) and use XMPP for IM. I would want to make sure  
that OpenSIPS could send Notify information to the XMPP clients telling  
them that someone is currently on the phone. I know you can use the  
pua_dialoginfo module to publish info about dialog states but I am not sure  
if what I am thinking (SIP with XMPP integration) is possible. So on  
OpenSIPS you would have a multidomain setup and the same would go for XMPP.  
So user bob at companyA.com would be set up on both OpenSIPS and XMPP. Bob's  
XMPP client (pidgin or whatever) would have buddies from companyA.com. XMPP  
would work as normal when it came to IM's and Presence, but I want to make  
it so that if alice at companyA.com calls someone OpenSIPS sends a XMPP Notify  
to the XMPP server and then the XMPP server notifies bob and his client  
shows that alice is busy or on phone or whatever.

Is this possible? If so how would Bob subscribe to Alice so that he could  
see her XMPP Client Presence along with her phone dialog presence and it be  
a single buddy on his list?

I know there are the pua_xmpp, xmpp and jabber modules but it sounds like  
those modules are mainly for being a gateway between SIMPLE and XMPP  
environments.
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