[Serusers] Do I have to use jabber module?

[C Y]

HI everyone
I want to realize two users who log in the same SIP server with Windows 
Messenge to communicate each other.Now they can communicate through 
voice.But they cannot send messenges to others.Do i have to use jabber 
module to implement the function or there is an other way to realize it?

thanks a lot.

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