Abbreviated and enhanced dialing apparatus and methods particula
Access code dialing apparatus and method
Acoustic coupling product label and method of using
Acoustic feedback suppression device particulary for auxiliary r
Acoustic signal transfer device
Active digit cancelling parallel dialer
Adaptive call progress tone detection system
Adaptive efficient single/dual tone decoder apparatus and method
Adaptive method and apparatus for detecting a stutter dial tone
Adaptive no balance DX signalling circuit
Adaptive ringer for telephone terminal
Adjustable-period dual-tone multifrequency generator
Alert muting method through indirect contact for portable...
Alphabetic telephone dialer apparatus and method
ANI auto dialer with carrier current interface
Answer supervision and service selection
Apparatus and method for a highly efficient low power driver...
Apparatus and method for accessing and maintaining a caller-ID b
Apparatus and method for audible signaling tone recognition
Apparatus and method for checking signals