Method and apparatus to validate a subscriber line
Method and arrangement for measuring holding time in...
Method and circuit arrangement used for rate setting in...
Method and device for charging during data communication time in
Method and device for variable, current rate signalling of in-ba
Method and switching device for billing telecommunications...
Method and system for a multiple line long distance discount...
Method and system for accounting communication charges
Method and system for accounting of services
Method and system for accumulating call prepayment
Method and system for allowing extended connections to...
Method and system for analyzing and preparing an optimum...
Method and system for assigning a communication to a preferred c
Method and system for automatically providing a customer...
Method and system for billing remote calls as if made from a...
Method and system for billing remote calls as if made from a...
Method and system for billing remote calls if made from a...
Method and system for billing subscribers in a...
Method and system for billing toll-free calls from public...
Method and system for blocking incoming calls to mobile...