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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 [[Computer telephony integration|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.

==Function==
Because a major part of IP PBX functionality is provided in software, it is relatively inexpensive and easy to add additional functionality, such as [[Conference call|conferencing]], [[XML-RPC]] control of live calls, [[Interactive voice response]] (IVR), [[Speech synthesis|TTS]]/[[Speech recognition|ASR]] (text to speech/automatic speech recognition), [[Public switched telephone network]] (PSTN) interconnection ability supporting both analogue and digital circuits, [[Voice over IP]] protocols including [[Session Initiation Protocol|SIP]], [[Inter-Asterisk eXchange]], [[H.323]], [[Jingle (protocol)|Jingle]] (extension of [[Extensible Messaging and Presence Protocol|XMPP]] protocol introduced by [[Google Talk]]) and others.

'''Features''' 

* Unlimited Extensions 
* Unlimited Auto Attendants
* Unlimited Voicemail Boxes 
* Cell Phone Integration
* Integrated Paging
* 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
* [[Direct Inward Dialing|DID]] Direct Inward Dialing
* Find Me/Follow Me
* Time of Day Routing
* Extension Call Recording
* On the Fly Recording 
* [[Last-call return|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
* [[Automatic number identification|ANI]] Routing
* [[DNIS]] Routing
* Enhanced Mobility
* Overhead Paging
* 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