Transmission system for coded speech signals and/or...
Transmission system for sending two signals simultaneously...
Transmit only acoustic coupler
Transmitter assembly for a telephone handset
Transmitting and receiving apparatus using single reversible...
Transmitting over power lines
Transmitting subscriber identity in mobile communication system
Transmitting/receiving system between pbx's
Transparent inband signaling
Transparent protected access to corporate dialing plan
Transponder for telemetering system
Transponder for transmitting data from digital encoding...
Transport of vertical control protocol messages on a...
Trigger mediation system
Tripping arrangement for ringing current signals in...
Truck communication system
True family telecommunication service
Trunk busy test circuit
Trunk busy test circuit
Trunk interface circuit with current compensation