Direct Inward Dialing - meaning and definition. What is Direct Inward Dialing
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What (who) is Direct Inward Dialing - definition

TELECOMMUNICATIONS SYSTEM WHICH ASSIGNS AN E.164 DIRECT-DIAL OUTSIDE TELEPHONE NUMBER TO INDIVIDUAL PBX EXTENSIONS FOR INCOMING CALLS
Directed inward dial; Direct dialling in; Direct Inward Dialling; Direct Dialing In; Direct Inbound Dialing; Direct Dial-In; Direct outward dialing; Direct Dial Central Office; Direct Inward Dialing; Direct Outward Dialing; Direct inbound dialing; Direct dial-in; Direct inward dialing

Direct Inward Dialing         
<communications> (DID) A service offered by telephone companies which allows the last 3 or 4 digits of a phone number to be transmitted to the destination exchange. For example, a company could have 10 incoming lines, all with the number 234 000. If a caller dials 234 697, the call is sent to 234 000 (the company's exchange), and the digits 697 are transmitted. The company's exchange then routes the call to extension 697. This gives the impression of 1000 direct dial lines, whereas in fact there are only 10. Obviously, only 10 at a time can be used. This system is also used by fax servers. Instead of an exchange at the end of the 234 000 line, a computer running fax server software and fax modem cards uses the last three digits to identify the recipient of the fax. This allows 1000 people to have their own individual fax numbers, even though there is only one 'fax machine'. {Dictionary of PC Hardware and Data Communications Terms (http://ora.com/reference/dictionary/terms/D/Direct_Inward_Dialing.htm)}. (1997-06-29)
Direct inward dial         
Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system. The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the PBX, and transmits the dialed telephone number to the PBX so that a PBX extension is directly accessible for an outside caller, possibly by-passing an auto-attendant.
direct dialling         
WIKIMEDIA DISAMBIGUATION PAGE
Direct dial; Direct Dialing; Direct dialing (disambiguation); Direct dialling
¦ noun the facility of making a telephone call without connection by the operator.

Wikipedia

Direct inward dial

Direct inward dialing (DID), also called direct dial-in (DDI) in Europe and Oceania, is a telecommunication service offered by telephone companies to subscribers who operate a private branch exchange (PBX) system. The feature provides service for multiple telephone numbers over one or more analog or digital physical circuits to the PBX, and transmits the dialed telephone number to the PBX so that a PBX extension is directly accessible for an outside caller, possibly by-passing an auto-attendant.