Dial up telephone conferencing system controlled by an...
Dial verifier, especially for facsimile transmission
Dial-in data transmission system with standby capability
Dial-up line modem directly compatible with mainframe host havin
Dialing plan for special access applications such as telemetry s
Digital communication system using telephone line and...
Digital musicians telephone interface
Digital screen phone terminal with graphical user interface
Digital subscriber line service over loaded loops
Digital telecommunications exchange system
Digital telephone data and control signal transmission system
Digital telephone set
Digital telephone switch
Digital telephonic system for stethoscope signal processing
Digital text messaging system and method
Direct access arrangement (DAA) circuit having automatic...
Direct connect modem deriving power from telephone line
Direct telephone dial ordering service
Direct telephone dial ordering service
Directionally-mapped, keyed alpha -numeric data input/output...