Data calls using both constant bit rate and variable bit...

Data extraction process

Data messaging method

Data transmission via a public switched telephone network

Detecting local exchange failure and resultant control of a comm

Device and method for improving the load distribution in a...

Device and method for transferring unbundled network...

Device and method for transferring unbundled network...

Device and method for transferring unbundled network...

Devices, systems, and methods for migration scheduling

Dial plan generator

Dial restoral method for digital circuits

Dialed number recognition arrangement

Dialed number service routing in a telephone network by...

Dialing plan information as provided to a telecommunications...

Digital dialed digit unlock method and system

Digital exchanging apparatus and method of communication...

Digital loop carrier system

Direct dialing-in method in a pabx

Direct distance dialing (DDD) access to a communications service