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PBX is a system that connects telephone extensions of a company to outside public telephone network as well as to mobile networks. An IP (Internet Protocol) PBX (Private branch exchange) is a PBX that provides audio, video, and instant messaging communication through the TCP/IP protocol stack for its internal network and interconnects its internal network with the Public Switched Telephone Network (PSTN) for telephony communication.

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 part of PBX functionality is provided in software, it is relatively inexpensive and makes it easy to add additional functionality, such as conferencing, XML-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)[1] and others.

SIP (Session Initiation Protocol) enabled PBX are used to make multimedia communication (voice and video calls) over IP network. It uses enhanced encryption techniques and proxy servers to form sessions of calls over internet.


(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
  • Soft phone
  • Call Transfer
  • Call Conference
  • Live Monitoring

IPBX Software[edit]

See also[edit]