Apparatus and method for optimizing the use of long distance tel
Apparatus and method for preventing unauthorized access to a sys
Apparatus and method for processing information from a...
Apparatus and method for providing multiple line billing in...
Apparatus and method for recording call related data
Apparatus and method for specifying and obtaining services...
Apparatus and method of providing a call service using a...
Apparatus and method to identify inter-MTA calls
Apparatus for delivery of prepaid telecommunication services...
Arrangement for managing voice over IP (VoIP) telephone...
Arrangement for outbound telecommunications
Arranging subscriber billing in telecommunication system
Assigning telecommunications services to matchable classes
Audible announcement played to calling party before...
Authentication system for a communication network
Authorized distribution of digital content over mobile networks
Automated emergency notification system
Automated prefix dialing system
Automatic billing system controller
Automatic generation of billing records at a telephone paystatio