Rapid dialing method for telecommunications
Rapid telephone call methods and systems
Recognition of a single frequency tone
Redial apparatus and methods for processing symbols input by a u
Redialing method by editing telephone number in telephone termin
Remote telephone call notification system
Remote telephone ringer controller
Remote telephone signaling circuitry and device
Remotely programmable, vandal-resistant voice communications uni
Remotely programmable, vandal-resistant voice communications uni
Remotely programmable, vandal-resistant voice communications uni
Removable button for a keypad
Ring code recorder
Ring control device
Ring detector
Ring discriminator
Ring filter for pots communication system
Ring generator
Ring tone detection for a telephone system
Ring tone visualizer