Public telephone set with internal charge processing
Public telephone system
Public telephone system
Public telephone system using a prepaid card to enable communica
Public telephone volume control
Public telephone with and method for cash payment function
Public terminal for access to a computer network
Public terminal receptacle
Public terminal receptacle
Pulse detector for counting dial generated pulses
Pulse dialing system for VoIP modem
Pulse receiver circuit providing longitudinal balance
Pulsed volume control of a magnetic ringer
Pure delay estimation
Push button phone capable of sending to the telephone line alpha
Push-button pay telephone dispenser
Push-button signal receiving circuit and a method of...
Push-button signal receiving device and a gain control method
Push-button telephone dialing device with telephone hold functio
Push-to-talk wireless telecommunications system utilizing a...