Trixbox, formerly known as "Asterisk@Home", is a CentOS Linux distribution that provides an open source telephony package based on the famous Asterisk Voice-over-IP PBX. It is a software PBX based on Asterisk. Initially, the primary advantage of a PBX was the cost savings for internal phone calls: handling the circuit switching locally reduced charges for telephone service via the central office lines. As PBX systems gained popularity, they were equipped with services that were not available in the public network, such as hunt groups, call forwarding, and extension dialing. In the 1960s a simulated PBX known as Centrex provided similar features from the central telephone exchange. A PBX is differentiated from a key telephone system (KTS) in that users of a key system manually select their own outgoing lines on special telephone sets that control buttons for this purpose, while PBXs select the outgoing line automatically or, formerly, by an operator. The telephone sets connected to a PBX do not normally have special keys for central office line control, but it is not uncommon for key systems to be connected to a PBX to extend its services. A PBX, in contrast to a key system, employs an organizational numbering plan for its stations. In addition, a dial plan determines whether additional digit sequences must be prefixed when dialing to obtain access to a central office trunk. Modern number analysis systems permit users to dial internal and external telephone numbers without special codes to distinguish the intended destination.
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1A2, 3COM, ACTIVE VOICE, ADTRAN, AGFEO, ALCATEL, ALLWORX, ALTIGEN, AMDEV VME, ASPECT, ASTERISK, AT&T, AUDIX, AVAYA, AVT, BBS TELECOM, BOGEN, CENTRIGRAM, CISCO, COMDIAL, DYTEL, eON MILLENIUM, ERICSSON, EXECUTONE, EXTROM, FUJITSU, HARRIS, HITACHI, INTER-TEL, ISOETEC, ITT, IWATSU-OMEGA, LEXAR, LUCENT, MACROTEL, MCK, MICROSOFT RESPONSE POINT, MITEL, NEC, NETAPP, NEWBRIDGE, NITSUKO, NORTEL, NORTHCOM, OCTEL, PANASONIC, PARADYNE, PLANTRONICS, POLYCOM, PREMIER, PROSTAR, SAMSUNG, SHORETEL, SIEMENS-ROLM, SIPXECS, SWITCHVOX, TADIRAN, TALKSWITCH, TEL-PLUS, TELCO SYSTEMS, TELECT, TELLABS, TELRAD, TIE, TOSHIBA, TRILLIUM, TRIXBOX, VALCOM, VERILINK, VMX, VODAVI, WALKER-RELIANT, WESCOM, WESTERN ELECTRIC, WYSE, ZULTYS.