Call processing system with an operator assistance in a telephon
Call processing using logical channel assignments
Call processor for a satellite communications controller
Call progress signal monitor and method for telephone systems
Call restricting method in packet switching network and network
Call service initialization arrangement
Call setup and channel allocation for a multi-media network bus
Called equipment selection method in ISDN packet switching mode
Calling channel in CDMA communications system
Calling method for communication terminal device
Cancelling circuit and transmission system
Capacity expander for telephone line
Capacity reallocation method and apparatus for a TDMA satellite
Carrier frequency sound transmission system
Carrier frequency spectrum generator using logic level input pul
Carrier offset tracking for a receiver using channel impulse res
Carrier recovery control with sequential FEC sync detection and
Carrier sense data highway system
Carrier sensing multiple access/collision detection local area n
Carrier supply for frequency division multiplexed systems