Billing
Software was created in order to handle billing and time tracking as well as
invoicing the customer for products and services. This software can also track
worked hours by employees, as well as the expenses related to projects or
clients.
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.