Menu level indicator for a telephone terminal

Message playback concurrent with speakerphone operation

Meter pulse filtering circuit for analog modems

Method and an arrangement for controlling the operating mode of

Method and apparatus for a host-based personal computer speakerp

Method and apparatus for active reduction of speakerphone...

Method and apparatus for active reduction of speakerphone...

Method and apparatus for active reduction of speakerphone...

Method and apparatus for adaptive volume control for a radiotele

Method and apparatus for automatically adjusting speaker and...

Method and apparatus for canceling tone signal noise generated w

Method and apparatus for controlling the drive frequency of a LE

Method and apparatus for decreasing distortion in a line...

Method and apparatus for digital PABX detection and modem...

Method and apparatus for gradual application of a hitless...

Method and apparatus for interfacing telephone apparatus to...

Method and apparatus for multiparty collaboration enhancement

Method and apparatus for noise cancellation

Method and apparatus for noise suppression and side-tone...

Method and apparatus for off-hook management of plural...