business telephone system is any of a range of a multiline telephone systems typically used in business environments, encompassing systems ranging from small key systems to large scale private branch. A business telephone system differs from simply using a telephone with multiple lines in that the lines used are accessible from multiple telephones, or “stations” in the system, and that such a system often provides additional features related to call handling. Business telephone systems are often broadly classified into “key systems”, “hybrid systems”, and “private branch exchanges”.

A key system[1] was originally distinguished from a Private Branch Exchange (PBX) in that it allowed the station user to see and control the calls directly, manually, using lighted line buttons, while a private branch exchange operated in a manner similar to the public telephone system, in that the calls were routed to the correct destination by being dialed directly. Technologically, Private Branch Exchanges, share lineage with central office telephone systems, and in larger or more complex systems, may rival a central office in capacity and features.


An IP PBX handles voice signals under Internet protocol, bringing benefits for computer telephony integration (CTI). An IP-PBX can exist as physical hardware, or can carry out its functions virtually, performing the call-routing activities of the traditional PBX or key system as a software system. The virtual version is also called a “Soft PBX”.

An IP (Internet Protocol) PBX (Private branch exchange) is a business telephone system designed to deliver voice or video over a data network and interoperate with the normal Public Switched Telephone Network (PSTN).

VoIP (Voice over Internet Protocol) gateways can be combined with traditional PBX functionality enabling businesses to use their managed intranet to help reduce long distance expenses, enjoy the benefits of a single network for voice and data and advanced CTI features or be used on a pure IP system which in most cases give greater cost savings, greater mobility, and increased redundancy.

An IP-PBX can exist as a hardware object, or virtually, as a software system.


Because a major part of IP PBX functionality is provided in software, it is relatively inexpensive and makes it easy to add additional functionality, such as conferencingXML-RPC control of live calls,Interactive voice response (IVR), TTS/ASR (text to speech/automatic speech recognition), Public switched telephone network (PSTN) interconnection ability supporting both analog and digital circuits, Voice over IP protocols including SIP, Inter-Asterisk eXchange, H.323, Jingle (extension of XMPP protocol introduced by Google Talk) and others.


(Features depend on system in place, some features require licenses or other software/hardware)

  • Unlimited Extensions
  • Unlimited Auto Attendants
  • Unlimited Voicemail Boxes
  • Cell Phone Integration
  • Integrated/Overhead Paging (PA System)
  • Remote Phones
  • Advanced User Interface (including Find me/Follow Me, Unified Messaging, Call recordings, Voicemail .wav).
  • Extension Groups
  • Auto Provisioning
  • Extension Range Flexibility
  • Caller ID Customization
  • DID Direct Inward Dialing
  • Find Me/Follow Me
  • Time of Day Routing
  • Extension Call Recording
  • On the Fly Recording
  • Call Return
  • Voicemail Callback
  • Voicemail to Email
  • SMS Voicemail notification
  • Voicemail Web Access
  • Voicemail Bypass
  • Intuitive VoIP Ready
  • Voicemail Blast Groups
  • VoIP Ready
  • Inbound Call Description
  • VoIP Compression
  • Outlook Integration
  • Announcement Interface
  • Call-out
  • Call Pickup
  • System Diagnositcs
  • Multivendor Phone Options
  • Analog Phone Support
  • BYO Phones
  • Call Parking
  • Call Barge
  • Dial by Name Directory
  • Powerful Reporting
  • CRM Integration
  • Remote Linked Servers
  • Operator Console
  • Custom Routing Rules
  • Conference Rooms
  • Outbound Dial Map
  • Speed Dial Numbers
  • Channel Bank Support
  • Multiple Music on Hold
  • Analog and Digital T1 Ready
  • PSTN or Digital Failover
  • NIS Routing
  • Advanced Routing (IVR)
  • Fast Pass
  • Caller Position Notification
  • Call Whisper
  • Auto call forwarding
  • Unified Messaging
  • Call Screening
  • ANI Routing
  • DNIS Routing
  • Enhanced Mobility
  • Custom VoIP Provider
  • Professional Development
  • Fax Support
  • Fax to Email
  • Fax PDF Support
  • ACD Features
  • Click to Dial
  • Softphone
  • Call Transfer
  • Call Conference
  • Live Monitoring

This entry was posted on Monday, November 28th, 2011 at 8:14 am and is filed under Call Center Solutions. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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