Adaptive echo canceller for voice messaging system
Adjunct processor embedded in a switching system
Alphanumeric caller identification telephone
Analog/digital voice storage cellular telephone
Analog/digital voice storage cellular telephone
Announcement apparatus for switching system
Anonymous interactive telephone system
Answering device
Apparatus and accompanying methods for preventing toll fraud thr
Apparatus and method for automatically determining whether a tel
Apparatus and method for obtaining information in a wide-area te
Apparatus and method for obtaining information in a wide-area te
Apparatus and method for transparent telephony utilizing speech-
Apparatus and methods for conveying telephone numbers and other
Apparatus for controlling digital voice recording and playback o
Apparatus for voice communication over local area networks
Architecture for voice messaging systems
Audio recording apparatus using an imperfect memory circuit
Auto response phone system
Automated call screening