The integration of the VoIP system into Outlook will allow you receiving electronic messages on missed calls, call transfers etc. By click of a mouse on the number you can also call the addressee from whom you missed the call.
IDC projected over 9 billion minutes of voice traffic to travel over worldwide packet networks in 2000, exceeding 135 billion minutes in 2004. Service revenue is projected at 1.6 billion in 2000 and 18.7 billion in 2004.