cheap phone service


 


  

  

  

  

cheap phone service

"PBX" redirects here. For the type of explosive, see Polymer-bonded explosive.

A Private Branch eXchange (also called PBX, Private Business eXchange or PABX for Private Automatic Branch eXchange) is a telephone exchange that is owned by a private business, as opposed to one owned by a common carrier or by a telephone company.

Overview

Originally an organization's manual switchboard (operated by a person plugging cables into sockets) was known as a PMBX (Private Manual Branch eXchange). These were gradually replaced by automated electromechanical and then electronic switching systems, called PABXs (Private Automatic Branch eXchange). As PMBXes are almost unheard of, the terms PABX and PBX have become synonymous. 100 minutes calls to Germany. When PABX's started being built using solid state and digital components the term EPABX came into use but PBX is still more widely recognized. PBX's are differentialted from "Key Systems" in that users of Key systems manually select their own outgoing lines while PBX'x select the out going line (trunk) automatically. Hybrid Systems combine features of both.

Using a PBX saves connecting all of a business's telephone sets separately to the public telephone network (PSTN or ISDN). Such a set-up would require every set to have its own line (usually with a monthly recurring line charge), and "internal" calls would have to be routed out of the building to a central switch, only to come back in again.

Home   janitorial supplies   beauty supply   unique party supplies   nails supplies   solar powered outdoor lighting   powered wheelchair   electric power generator   remote power monitoring   hypertech power programer   furman power conditioner   programmable power supplies   thinkpad power   small power generator   power slot rotor   laser diode high power   puls power supply   email marketing services   debt reduction services   email service   video conferencing services   merchant services credit card processing   internet service provider hosting   internet advertising services   online tax service   debt reduction service help   federal debt consolidation services   payroll service software   credit management services   black dating online services   commercial cleaning services   dating online personals service single   day trading services   low rate phone service   online photo service   low cost internet services   eci conference call services   local phone service nc   cleaning services in atlanta   internet service providers isps   merchant services usa   disk data recovery services   fax blast service   single parents dating service