PBX

(redirected from PBXs)
Also found in: Dictionary.

PBX

(communications)

private branch exchange (PBX)

A private telephone switching system located on the customer’s premises, usually serving an organization (such as a business or government agency). It switches telephone calls within a building and also to an outside telephone network.

PBX

PBX

(Private Branch eXchange) An inhouse telephone switching system that interconnects telephone extensions to each other as well as to the outside telephone network (PSTN). A PBX enables a single-line telephone set to gain access to one of a group of pooled (shared) trunks by dialing an 8 or 9 prefix. PBXs also include functions such as least cost routing for outside calls, call forwarding, conference calling and call accounting. Modern PBXs use all-digital methods for switching, but may support both analog and digital telephones and telephone lines. See IP PBX and WPBX.


An Early PBX
This PBX began operation in Bangor, Maine in 1883. (Image courtesy of AT&T.)









A Field Switchboard
This portable commutator was a one-wire telegraphic switchboard for military field service in 1914. Made by Northern Electric (now Nortel Networks), it was one of the first communications products built for the battlefields of World War I. (Image courtesy of Nortel Networks.)
References in periodicals archive ?
Calista, San Jose, Calif., a provider of gateways that link digital PBXs to IP networks, has created a demonstration program that uses Calista's Digital Phone Control Protocol (DPCP) to connect Cisco's IP-PBX to proprietary digital telephones.
According to the company, presence is typically available on the office IP PBX but delivers the greatest benefits to people who are not in the office, working on the public network, at home or on a mobile phone.
The company said that the new solution is also the first enterprise-grade T1/E1 PBX-to-Skype gateway to achieve Skype certification and it is also fully certified and endorsed by key PBX vendors.
Although many IP-PBX systems still use proprietary protocols to control the IP phones, this is only because most of them are ports of traditional PBXs, where the proprietary stimulus protocol is simply tunneled-over-IP packets.
The BroadWorks VoIP application integrates hosted PBX, mobile PBX, IP Centrex, business trunking and residential broadband services into one application.
"Traditional PBXs are proven and reliable," says Dan Dearing, vice president of marketing for Nextone, which supplies voice virtual private network (VPN) capabilities to service providers, allowing them to offer VPN services to enterprises.
* Extend the school's investment by eventually letting the same hardware that links the remote and central PBXs double as a "regular" network switch that's part of the campus backbone; and
What these businesses need is an affordable and comprehensive call center solution that works with their existing PBX or an AltiServ PBX."
Sulkin believes existing PBXs have the pieces in place to support multimedia systems.
Williams sees call centers as a major opportunity; another is enhanced network management via PBXs. Schmiedeke believes broad-band services, multimedia systems and wireless technology are important applications in addition to call centers.
"As ISDN primary rate is brought on-line and private networks migrate to the new features that PBXs using primary rate will offer, the older two-wire 2500-type phones will still be needed."
No matter what steps are taken, PBXs and voice mail systems can be victimized by computer hackers.