asterisk users - Sep 2010 - about yahoo messager work with asterisk

Hi  Asterisk Gurus

    Does it possible let asterisk work with yahoo messager?
    To let Yahoo messager have a voice call with SIP client?
    I had find that Yahoo message voice call use SIP . But did not know how
it authentication with yahoo sip server side.

    Any advise is welcome!


                              Thanks


Regards

-Qingquan
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