asterisk users - Jan 2007 - ELMEG IP290 and voicemail

Hello,

I have Elmeg IP290 phone and have problems with VM. I don't know how to 
configure this IP phone, that it could call to *97@192.168.0.1 if I 
pressed "VMail" button. Now if I press buttom "VMail" , ip
phone dials:
sip:asterisk@192.168.0.1 (192.168.0.1 - Asterisk IP).  So I don't 
understand , from where it takes "asterisk", cause I have never write 
this word in configurations.... Maybe it takes realm...

Thanks for help