Detection of a call-waiting tone by a modem
Detection of TDD signals in an automated telephone system
Determining and disclosing the indentity of telephone caller
Determining whether a telephony call is permitted based on...
Device and a method for feeding electric devices from a...
Device and method for isolating voice and data signals on a comm
Device and method for telecommunication systems
Device and method to establish communication
Device for aiding maintenance of an electromechanical installati
Device for automatically processing incoming electronic mail...
Device for connecting a subscriber line to a selected internal l
Device for controlling the application of power to a computer
Device for making videotape recording reservations over a teleph
Device for multimedia communication
Device for remotely resetting electronic appliances in response
Device for telephone monitoring of patients having peripheral ar
Device for the transmission of data by telephone line
Device for transmitting video and audio signals through an integ
Device for use in communication systems
Device to block unauthorized modem access over a PBX line