Acoustic feedback suppression device particulary for auxiliary r
Adaptive ringer for telephone terminal
Alert muting method through indirect contact for portable...
Apparatus and method for checking signals
Apparatus and method for controlling incoming melody
Apparatus and method for controlling incoming melody
Apparatus and method for filtering voiceband and metering...
Apparatus and method for telephone, intercom, and clock
Apparatus for connecting and disconnecting a ringing signal to a
Apparatus for disabling a telephone ringer
Apparatus for generating alerts of varying degrees
Apparatus for timely controlling the sound characteristic of a s
Apparatus for timely controlling the sound characteristic of a s
Auditory user interface
Automatic call distribution with answer machine detection appara
Automatic electronic audio signal attenuating device and method
Automatic signalling-system switching device for digital line ci
Bell sound synthesizer
Busy/no-answer call completion equipment
Call management system