Telephone exchanges

telecommunications system used in public switched telephone networks or in large enterprises

telecommunications system

telecommunications system which assigns an E.164 direct-dial outside telephone number to individual PBX extensions for incoming calls

distribution frame where cables are cross-connected in telephony

A softswitch (software switch) is a call-switching node in a telecommunications network, based not on the specialized switching hardware of the traditional telephone exchange, but implemented in software running on a general-purpose computing platform. Like its traditional counterparts it connects telephone calls between subscribers or other switching systems across a telecommunication network. Often a softswitch is implemented to switch calls using voice over IP (VoIP) technologies, but hybrid systems exist.

device that directs incoming phone calls

LinuxMCE (Linux Media Center Edition) is a free and open source software platform with a 10-foot user interface designed to allow a computer to act as a home theater PC (HTPC) for the living-room TV, personal video recorder, and home automation system. It allows control of everything in the home, from lighting and climate to surveillance cameras and home security. It also includes a full-featured VoIP-compatible phone system with support for video conferencing.

connection of a phone to a non-local office

electromechanical multi-pole switch controled by a chain of pulses

a parameter used in data and voice protocols

thumb|Typical standard phone used with Centrex. Note the "Recall" button and the Message Waiting Lamp.Centrex is a portmanteau of central exchange, a kind of telephone exchange. It provides functions similar to a PBX, but is provisioned with equipment owned by, and located at, the telephone company premises.

Elastix is a unified communications server software that brings together IP PBX, email, IM, faxing and collaboration functionality. It has a Web interface and includes capabilities such as a call center software with predictive dialing.

thumb|Silicon Laboratories Si3210M-FM - Programmable CMOS SLIC/Codec with Ringing/Battery Voltage Generation (Performs all BORSCHT functions) BORSCHT is an acronym for the set of functions performed by a subscriber line interface circuit (SLIC) in the line card of a telecommunication system providing plain old telephone service. The letters represent the following functions: battery feed (B), overvoltage protection (O), ringing (R), signaling (S), coding (C), hybrid (H), and test (T).

trixbox (formerly Asterisk@Home) was a software PBX based on Asterisk.

automated telephone exchange

landline telephone option that lets European customers use a third party for call charges