Call parking
Encyclopedia
Call park is a feature of some telephone systems that allows a person to put a call on hold at one telephone set and continue the conversation from any other telephone set.

The “call park” feature is activated by pressing a preprogrammed button (usually labelled “Call Park”) or a special sequence of buttons. This transfers the current telephone conversation to an unused extension number
Extension (telephone)
An extension telephone is an additional telephone wired to the same telephone line as another. In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions". Such extension phones allow making or receiving calls in different rooms,...

 and immediately puts the conversation on hold. (This is called parking the call; and the call is said to have parked onto a certain extension. Essentially, call parking temporarily assigns an extension number to an incoming call.) The telephone system will then display the extension number of the parked call so that the call can later be retrieved.

At this point, the telephone system will often provide an option for the person to make an announcement through a public address system
Public address
A public address system is an electronic amplification system with a mixer, amplifier and loudspeakers, used to reinforce a sound source, e.g., a person giving a speech, a DJ playing prerecorded music, and distributing the sound throughout a venue or building.Simple PA systems are often used in...

 (often consisting of some or all of the telephone sets and or overhead paging speakers controlled by the telephone system). Making such announcements in such a way is referred to as paging.
To access the paging system, the user must enter the paging access code or press the "page" button on the telephone, and announce the call parked extension. An example would be at a grocery store where the bakery has a call parked. The user would say "Bakery you have a call parked on 627" and the bakery department would then dial 627 to access the call on hold.

A set time is then provided for any person to retrieve the call by dialing the extension number of the parked call on any telephone set.

If no one picks up the parked call within the set time, the telephone system may ring back
Automatic ring back
Automatic ring back is a service offered by phone companies.Normally, when a person's line is busy, one has to call back every few minutes to check if their line is free yet. With automatic ring back, a code can be dialed into the telephone keypad to enable ringback...

 the parked call. This transfers the parked call back to the person who originally parked the call.

Uses of call parking

Call parking is often useful in buildings with many offices or with more than one floor, and with most of the areas having access to one or more telephone sets.
  • If the desired called party
    Called party
    The called party is a person who answers a telephone call. The person who initiates a telephone call is the calling party....

     is not the person who picked up the call, and the desired called party is at an unknown location, the person who picked up the call may park the call and then use the public address system to page the desired called party to pick up the call.
  • During a conversation, a person may need to go to another office for some reason (for example, to retrieve an important file); parking the call allows this person to continue the conversation after arriving at the other office.

See also

  • Call pick-up
    Call pick-up
    Call pick-up is a feature used in a telephone system that allows one to answer someone else’s telephone call. The “call pick-up” feature is accessed by pressing a preprogrammed button , or by pressing a special sequence of buttons on the telephone set.In places where “call pick-up” is used, the...

  • Private branch exchange
  • Telephone
    Telephone
    The telephone , colloquially referred to as a phone, is a telecommunications device that transmits and receives sounds, usually the human voice. Telephones are a point-to-point communication system whose most basic function is to allow two people separated by large distances to talk to each other...



See Asterisk hand book also.
The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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