PBX

From Bandipedia

Private Branch Exchange

A telephone exchange that is owned by a private business. A PBX connects all of a business's telephone sets to the public telephone network (PSTN). All devices connected to the PBX are referred to as extensions (i.e. fax machines and modems).

The PBX equipment is usually installed at a business's premises, and connects calls between the telephones installed on-site. A company may use several outside lines (called trunk lines) for making and receiving calls external to the site which connect to the PSTN. Companies can connect multiple sites by linking PBXs together with trunk lines.

There are many PBX hardware manufacturers. Some of the most well known include:Avaya (formerly Lucent and AT&T), Alcatel, Comdial, Cisco Systems, Database Systems Corp., Ericsson, Fujitsu, InterTel, Mitel, NEC, Nortel, Panasonic, Samsung, Siemens AG, ShoreTel, and Toshiba.

Listed below are several functions and features that a PBX can perform. Different manufacturers offer different functionality.

  • Establish connection between multiple telephone handsets.
  • Call Metering
  • Speed Dialing
  • Call transfer
  • Direct Inward Dialing
  • Customized Abbreviated dialing (Speed Dialing)
  • ACD Automatic Call Distribution
  • CTI Computer Telephony Integration
  • IVR Interactive Voice Response
  • Voice broadcasting
  • Voice mail
  • Follow-me
  • Call forwarding on absence
  • Call forwarding on busy
  • Music on hold
  • Automatic ring back
  • Night service
  • Call waiting
  • Call pick-up
  • Call park
  • Call conferencing
  • Custom greetings
  • Predictive Dialer
  • Shared message boxes (where a department can have a shared voicemail box)
  • Automated directory services (where callers can be routed to a given employee by keying or speaking the letters of the employee's name)
  • Call accounting
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