Portable telephone set with a vibrator having an automatic switc
Portable telephone terminal with toll number retrieval function
Power supply system including ringing voltage reset under low in
Pre-ring caller identification apparatus and method and call scr
Precision FET control loop
Preprogrammed autodialer and related process
Process and apparatus for control of a hands-free telephone set
Process and apparatus for interaction between a telephone and it
Process for transmitting a telephone number of a desired...
Processes and systems for screening work orders
Programmable audio alert system and method
Programmable dialer system
Programmable dialler for a mobile telephone
Programmable ring generator
Programmable timer circuit for the signal generator of a communi
Progressive alert indications in a communication device
Pulse detector for counting dial generated pulses
Pulse dialing system for VoIP modem
Pulsed volume control of a magnetic ringer
Push-button signal receiving device and a gain control method