Expansion port for use in a communication system

Fast last digit detection of a dialed telephone number

Fault tolerant service-providing apparatus for use in a telecomm

Fault tolerant telephony control

Fault tolerant telephony control

Fault tolerant voice processing system

Frequency deviation detecting apparatus and frequency...

Impulse signal convertor

Integrated telecommunication system with improved digital voice

Intelligent services network adjunct processor

Inter-half call protocol negotiation techniques

Intraswitch transition to new line support equipment

Local area network communications system for maintaining service

Membrane switch for a telephone handset

Method and apparatus for controlling an exchange

Method and apparatus for determining digits dialed using a selec

Method and apparatus for improved call control scheduling in a d

Method and apparatus for maintaining real-time busy status infor

Method and apparatus for processing call number information for

Method and apparatus for universal telephone operator service