Apparatus and method for determining cost of telephone calls

Apparatus and method for ensuring a real-time connection...

Apparatus and method for ensuring a real-time connection...

Apparatus and method for ensuring a real-time connection...

Apparatus and method for generating call duration billing record

Apparatus and method for generating call information data...

Apparatus and method for integrating phone communications...

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 determining switch utilization within a

Apparatus and method of providing a call service using a...

Apparatus and method to identify inter-MTA calls

Apparatus and method to identify potential work-at-home callers

Apparatus for and method of verifying service user's information

Apparatus for delivery of prepaid telecommunication services...

Apparatus for displaying call charges in telephone and method th