Apparatus and method for effecting a communication...
Apparatus and method for managing BLF information in an...
Apparatus and method for providing switching at a telephone...
Apparatus and method of replacing telephony cards without...
Apparatus for communication between a telephone exchange and con
Apparatus for electronic exchange having a general-purpose bus s
Apparatus for receiving tone signal, apparatus for...
Architecture for distributed control telecommunication systems
Arrangement for initializing a CENTREX console interface circuit
Attendant console sharing system and method in centrex
Automated matrix for communication line connections
Automated recovery of telecommunication network elements
Automated ringing of an operator for directory assistance calls
Backup apparatus against line defect and backup method against l
Boot system for distributed digital data processing system
Centralized service circuit deployment
Circuit arrangement for centrally-controlled telecommunications
Circuit arrangement for telecommunication switching systems conn
Circuit arrangement for telecommunication switching systems, par
Circuit for translating telephone numbers