Read the following MSKB articles:

Q307888 -"HOW TO: Use Windows Messenger to Make Voice Calls to Another Computer in Windows XP"

Q324214 -"You Cannot Make Phone Calls or Start Voice or Video Conversations with Windows Messenger"


Good Luck,

Cetin


Trying to unweave, unwind, unravel
And piece together the past and the future,


T. S. Eliot