PBX features

PBX features
A list of features a PBX might support:

Please help us explain all these functions - or add other functions!
Also, edit the descriptions and add examples of how to achieve each function in Asterisk, either system wide or per channel type depending on the function.

   * Account Code: Account code for dialing calls
   * Alternate Number Ring: Assign a different number to same line that rings with a different cadence
   * Attendant: Main Operator extension
   * Autodialer: Support multiple autodialing techniques
   * Automatic Attendant
   * PBX Automatic Line Selection
   * Automatic Hold
   * PBX Automatic Redial
   * Automated directory: Automatically connect to an extension by name
   * Automatic Call Distribution: ACD
   * Barge-In: Allow an extension to break into a call at another extension
   * Billed Calls Only: Outgoing calls must be collect or 3rd-party billed
   * Boss-secretary functions: The boss'es phone and the secretary's phone are linked togheter
   * PBX Busy Ring
   * Call Back
   * Call Center: Organizations using PBX technology
   * Call Forwarding: Redirects all incoming calls towards other extension
   * Call Monitoring
   * Call Recording
   * Call Return: ??
   * Call Through: Service for savings on local interconnect charges
   * Call Transfer: Hand a call off to another extension
   * Call Trace: mark a call in system logs as requiring tracing or special attention
   * Call Park: Place a call on hold and allow anyone to dial an extension and take the call
   * Call Pickup: Take a parked call off hold
   * Call Waiting: Receive a tone indicating another call is waiting for attention
   * Calling ID: Identify (or block identification) of caller's phone number or phone number and name
   * PBX Calling Plans
   * Camp On
   * Computer Telephony: technology encompassing many PBX features
   * Conference Call: Allow 3 or more parties to connect together
   * Consultation Hold: Allow caller to be put on hold while user calls another extension
   * PBX Custom Greeting: Change announcement according to special criteria
   * PBX Custom Menus: Customized option menus for an automated attendant
   * Device Inventory
   * PBX Direct Inward System Access: In short: DISA
   * Direct Line, HOT line or Private Line Automatic Ringdown: connects directly to another extension (might be the operator) when phone is taken off hook
   * Disable Call Waiting: Prevent call waiting for one call
   * Do Not Disturb: In short: DND
   * Extension Dialing: Dial a number on the system with only 1, 2, 3, 4 or 5 digits
   * Extension Mobility: Sometimes known as extension roaming
   * PBX Failure Alarm: Rings a remote alarm if the PBX fails
   * Fax on Demand: Allow the user to be given a fax
   * Follow Me: have calls automatically transferred elsewhere
   * Forward on Busy/No Answer transfer if line is in use or doesn't answer
   * Hunt Groups: transfer a busy number to another extension
   * PBX Hold: Allow a call to be kept in the system when hanging up
   * PBX Incoming Only: Line cannot dial out
   * Incoming Queue: Place incoming calls in a wait list to be answered
   * Interactive Voice Response; Automatic call answering and routing
   * intercom: solves the problem of yelling to your secretary thru the wall.
   * IP Telephony: VoIP calling
   * Last Number Redial: dial a code to call the last (regular) number dialed
   * Least Cost Routing: routes calls from fixed-to-mobile via cheaper mobile-to-mobile calls.
   * Location-Based Routing: Route an incoming call dependent on where the caller is (ANI application)
   * Message Waiting Indicator: MWI
   * Mobility Extension (Mobex): for connecting mobile phones and other external telephony devices to the PBX.
   * PBX Music on Hold: play music or a recording while the caller is on hold
   * Night Answer: change where calls go if line is placed in 'night service'
   * Non Supervise: Line that can answer without giving supervision allowing a non-charged call.
   * PBX Outgoing Only: Line cannot receive calls
   * PBX Override Line: Allow a higher-priority user to seize use of a trunk for outgoing call
   * PBX Performance Measurements
   * Predictive Dialing - Automatically dial numbers connecting live answers to agents
   * Public Address - Similar to intercom but uses an external audio system. Example, overhead paging in a warehouse environment.
   * Restricted extension: Extension cannot be dialed from outside line or some or all inside extensions
   * Screen Pop
   * PBX Series Completion
   * PBX Seize Call: Allow an extension to take a call from another extension and disconnect the other extension
   * Skill Based Routing
   * SMS Server: Sending and receiving SMSs on the PC, multiple sending, sending to a closed user group..
   * Softphone: Embedded PBX features in web or PC applications
   * Speed Dial: ??
   * Three Way Calling
   * PBX Toll Restriction: Limit calls to certain numbers
   * Voice Messaging: voice mail and give greeting / announcements
   * Voice Broadcasting: Send recorded phone messages
   * Visual Phone Dialer: Visual interface for handling, viewing and monitoring all desk phone call activity from the PC
   * Voice Portal:
   * Wake-up Call: Automatically send wake up calls
   * Web-Based MACs