Dial unit detachably mounted on public telephone for equal acces
Dial-around compensation method and system
Dialing plan service including outgoing call screening,...
Differentiated threshold value behavior in prepaid services
Direct distance dialing (DDD) access to a communication...
Directory dialing telephone set
Display based marketing message control system and method
Display control device allowing information transmission to both
Distributed automatic route selection using RIP caching
Domestic origination to international termination country...
Domestic to country call intercept process (CIP)
Drive-in restaurant credit-card transaction system
DTMF lockout utility using epoch time stamp
Dual channel ISDN terminal call identification and switching sys
Dynamic carrier selection
Dynamic charging for telecommunications services in accordance w
Dynamic individual phone rates
Dynamic traffic distribution
Dynamic traffic management in an intelligent network of a...
Electronic directory system and method