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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.
An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing exchange.. One type of off-premises extension, connected to a private branch exchange (PBX), is generally used to provide employees with access to a company telephone system while they are out of the office.
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.
Later extension instruments were: for extension 1 the Tele. 321 or 328 and for extension 2 the Tele. 326 or 327. When this system was eventually revisited and brought up to date, with the 700 series Plans 105 and 107, the equivalent control unit was dubbed 'The Planset'.
Vocabulary for 3GPP Specifications (new) [2] ITU-T Rec. Q.1741-4 (10/2005) [3] Dictionary for OMA Specifications [4] CSPS ITU GSMA: Mobile Station International ISDN Number(s) MSISDN Format and Details [5] ITU-T Rec. Q.1741-4 (10/2005) [3] Mobile Terms & Acronyms [6] ITU: Mobile International ISDN Number Vocabulary of Switching and Signalling ...
An ISDN phone. Basic Rate Interface (BRI, 2B+D, 2B1D) or Basic Rate Access is an Integrated Services Digital Network (ISDN) configuration intended primarily for use in subscriber lines similar to those that have long been used for voice-grade telephone service. As such, an ISDN BRI connection can use the existing telephone infrastructure at a ...
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 ...