Dat storage back-up and modem apparatus
Data communication apparatus having a function of recording a vo
Data communication apparatus having a reprogrammable voice memor
Device for processing digital signal in audio-frequency bandwidt
Dial-less calling device
Digital dictation system with voice mail capability
Digital secretary
Digital telephone answering set
Directory answering machine
Directory management system and method
Distributed control and storage for a large capacity messaging s
Distributed system for call processing
Distributed system for call processing
DOS compatible dictation and voice mail system
DTMF signal detection apparatus