Method and apparatus for real-time billing account query

Method and apparatus for retroactively updating a...

Method and apparatus for screening telephone calls

Method and apparatus for selective post-call audio logo/message

Method and apparatus for storing call feature data

Method and apparatus for telephone call sub-billing

Method and apparatus for the billing of value-added communicatio

Method and apparatus for the billing of value-added communicatio

Method and apparatus for tracing a specific communication

Method and apparatus for utilizing a tiered flat rate...

Method and apparatus for validating pre-pay and post-pay...

Method and apparatus for viewing real time telephone charges

Method and apparatus in a communications system for...

Method and apparatus to provide pay-per-call performance...

Method and apparatus to provide pay-per-call performance...

Method and apparatus to validate a subscriber line

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...