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In middle 20th century telephone jargon, the first telephone on a line was a "Main Station" and subsequent ones "Extensions" or even called as intercom. Such extension phones allow making or receiving calls in different rooms, for example in a home, but any incoming call would ring all extensions and any one extension being in use would cause ...
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
However, the service may be combined with direct outward dialing (DOD) allowing PBX extensions direct outbound calling capability with identification of their DID telephone number. In the United States the feature was developed by AT&T in the 1960s, patterned upon the earlier IKZ service of the Deutsche Bundespost in Germany.
Extension mobility is often by people who frequently travel between different company locations. They can use any fixed-line phone in the company as if it is their own telephone by logging in. Extension Mobility is also useful in situations where people don’t have a dedicated desk of their own. In a flex-office where people just enter and ...
A sign in the US restricting cell phone use to certain times of day (no cell phone use between 7:30–9:00 am and 2:00–4:15 pm) (from Mobile phone) Image 42 The LG Prada with a large capacitive touchscreen introduced in 2006 (from Smartphone )
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 (often consisting of some or all of the telephone sets and or overhead paging speakers ...
This feature allows settings stored on a server to be downloaded to the phone, based on user login. The user logs into the phone and that phone becomes the user's extension. This feature requires both a client (phone) and a server, usually in the context of unified communications [2] Secure encrypted communications
Extension telephone bell used by taxi service in Rovigo. Extension bell located on the exterior of a lighthouse in Sprogø. An extension bell or extension ringer [1] is a device that generates a sound to indicate an incoming telephone call, but is not included in a telephone set itself. Extension bells may be louder than ordinary telephone ringers.