telecommunication equipment, namely, central office, local, tandem, and gateway switches; wire and wireless private automatic branch switches; key telephone switches; data packet network switches; frame relay switches; remote switches; cellular mobile telephone switches; synchronized optical network access, transport and switching nodes; base site controllers, transceivers and test bays; microwave radios which include transmitters, receivers, repeaters, digital processors, and operating software; transmission systems which include channel banks, multiplexors, digital loop carriers, digital cross connects, fibre feeders, copper feeders, radio transmitters and operating software; automated attendant switches; workstations comprising database and visual display terminals that provide traffic billing, call completion and assistance features; switching software; residential, public, business and mobile/cordless telephone sets; headsets; telephone jacks; line connectors; video and text terminals; man-machine interface workstations, comprising database and visual display terminals, that provide integrated maintenance and administration features for telecommunication switching systems; copper cable; optical fiber cable; submarine cable; electrical protectors; connectors used to connect or terminate telephone wires to central office, key system or PBX switching systems; cable terminals to provide protective and inter-connection terminals for feeder cables; indoor and outdoor frames to allow in-coming trunk lines to be cross connected with local telephone lines at a switching system; mechanical cable splicers and strippers to splice or strip cables; attenuators; multiplexors; line concentrators; multiplex terminals, both digital and fibre, which allow a number of voice or other channels to be transmitted over a single set of wires; loop carriers to transmit voice channels over a distance either through telephone poles with a repeater system or through a fibre optic transmission system; analog and digital radios; antenna; coder-decoders ("codecs") to convert voice signals from analog form to digital signals acceptable to PBXs and other transmission systems and then covert the data back to analog; channel banks; repeaters; repeater and span lines; network local test units to test local loops, central office subscriber line equipment, etc. from a control point, usually a network node or central office; network remote test units to test loops, office subscriber line equipment, etc. from a remote location; network loop reporting and test systems comprising a computer and an operating software designed to provide information related to operating system needed repairs; digital announcers; billing media converters; paging and response systems comprising key services modules and hand free terminals; power plants containing batteries, monitors, alarms, fuses, breakers, rectifiers, transformers and control panels; electrical power supplies; rectifiers; direct current to direct current converters; ringing machines; tone machines; telephone operating software; integrated circuits; semiconductors; transformers; diodes; resistors; capacitors; transistors; printed circuit boards; magnetic tapes; both blank and prerecorded for use in connection with operating and applications software; tape drives; and read only memory on compact disk, both blank and prerecorded for use in connection with operating and applications software; computer telecommunication software for recording, storing and delivering voice messages; automatic call distribution software; intelligent networks comprising signal transfer/switching point link software, and signal control point databases; optical sources comprising lasers, LEDs, semiconductor chips, optical receivers, modules, amplifiers and optical detectors