Apparatus and method for effecting a communication...

Apparatus and method for managing BLF information in an...

Apparatus and method for providing switching at a telephone...

Apparatus and method of replacing telephony cards without...

Apparatus for communication between a telephone exchange and con

Apparatus for electronic exchange having a general-purpose bus s

Apparatus for receiving tone signal, apparatus for...

Architecture for distributed control telecommunication systems

Arrangement for initializing a CENTREX console interface circuit

Attendant console sharing system and method in centrex

Automated matrix for communication line connections

Automated recovery of telecommunication network elements

Automated ringing of an operator for directory assistance calls