Method and apparatus for voice-over IP services triggered by...

Method and apparatus for voice-over IP services triggered by...

Method and apparatus for wideband transmission of digital signal

Method and apparatus for wireless communication of digital data

Method and apparatus for wireline characterization

Method and apparatus of certifying a telephonic transmission

Method and appartus for transmitting coded audio signals through

Method and arrangement for increasing data transmisssion rate ov

Method and circuit for operating a telecommunications network

Method and circuitry for controlling voice mail, call logging an

Method and device for establishing bidirectional communications

Method and device for returning to a normal communication link a

Method and means for preventing fraudulent use of telephone netw

Method and microcomputer system for the automatic, secure and di

Method and system for a wireless digital message service

Method and system for activation of a local terminal

Method and system for adaptively adjusting modem operating...

Method and system for allowing switched voice and data communica

Method and system for authorization of account-based...

Method and system for billing an ISDN data user interconnection