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
Communication system distributed processing message delivery sys
Communication system supporting remote operations
Communications network routing and management system
Communications switch permitting transparent maintenance of swit
Communications system and interface circuit for interconnecting
Control data transmission system for private branch exchange
Controlling multi-fort hunt groups in a distributed control swit
Controlling multi-port hunt groups in a distributed control swit
Convertible switched telephone exchange
Cross point mixer for a telephone set
Cross point switch with power failure mode
Cross-connect switch