Call queuing utilization reporting
Call reporting
Call validation system
Call-processing system and method
Cascade accounting of connection-oriented communication...
Coil operated telephone
Coin operated telephone
Communication gateway system
Communication method of supplying information in intelligent net
Communication method of supplying information in intelligent net
Communication method of supplying information in intelligent...
Communication system architecture, apparatus and management...
Communications network
Communications system for a service provider
Competitively bidding service centers
Computer-controlled telecommunications system
Computer-controlled telecommunications system
Computerized system and method for displaying line usage...
Computerized telephone accounting system
Converting a toll calling area to an extended area service