Current supply circuit for telephone exchange
Current supply system for subscriber line circuits
Current supplying circuit with shorted-to-ground fault...
Current weighting circuit
Current-limited gyrator
Customer account online servicing system
Customer definable integrated voice/data call transfer...
Customer defined call setup
Customer defined call setup
Customer information announcement service
Customer line tester
Customer premises broadband interface system and method
Customer programmable automated integrated voice/data...
Customisation of an electronic device
Customizability of event notification on telephony-enabled...
Customized telecommunication service
Customized telephone greeting system
Cut off switch for the phone transmitter