Distributed connection control in telecommunication networks
Distributed control exchange
Distributed control type electronic switching system
Distributed network control and fabric application interface
DTMF detection based on LPC coefficients
DTMF signal judging apparatus
DTMF signal judging apparatus
DTMF signal transmission method and communication apparatus
DTMF signal transmission method and communication apparatus
DTMF tone generation in a media gateway
Dual span monitoring system for maintenance shelf control
Dual tone multifrequency signal detection and identification met
Dynamic and scheduled computer telephony resource allocation
Electronic cross-connect system
Electronic exchange apparatus having separated exchange unit and
Electronic micro-controller conversion module for step by step s
Electronic step-by-step telephone switching system
Electronic telephone apparatus able to supply sync clock signals
Electronic telephone exchange and method of connecting ports of
Exchange having a display apparatus for displaying calls termina