Notification about the incoming calls, addressed to your land line or
office phone, coming to your cell phone. For instance, if you had a call to the
office at the moment when you were unavailable, a notification about the missed
call will come to your mobile phone.
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.