Direct Inward Dialing

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direct inward dialing

[də′rekt ¦in·wərd ′dīl·iŋ]
The capability for dialing individual telephone extensions in a large organization directly from outside, without going through a central switchboard.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Direct Inward Dialing

(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.
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(Direct Inward Dialing) The ability to make a telephone call to an internal telephone extension within an organization without having to go through an operator.
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References in periodicals archive ?
DIDX is the most senior and most awarded platform provider of direct inward dialing phone numbers.
To get more information about direct inward dialing software, visit
DIDX representatives welcome visitors at Comptel Plus Fall 2013 booth 325 to discuss current successes and issues in telecommunications and unified and cloud communications' direct inward dialing services.
New Orleans, LA, April 26, 2012 --( DIDX, world's largest and most recommended wholesale direct inward dialing phone number marketplace, will exhibit at 2012 CTIA Wireless Conference from May 8 - 10 in New Orleans, LA.
(OTC BB: VSRV), a low-cost, next-generation Internet telephony software and service provider, announced today that Super Technologies, Inc., a leader in wholesale direct inward dialing (DID) and session initiation protocol (SIP) services, will offer Voiceserve's award winning mobile dialers through its massive DIDx network.
New York, NY, March 02, 2011 --( Direct inward dialing is an integral part of successful VoIP communications business.
Carriers and operators, both wireless and wired, who wish to offer local presence, virtual office, and connections to VIP of their end-users, can buy direct inward dialing (DID) numbers via session initiation protocol (SIP), Asterisk (IAX), H323, freeSWITCH, Kamailio and other applications and protocols via the DIDXchange.
Dubai, United Arab Emirates, October 20, 2010 --( Today at the Gitex Conference in Dubai, United Arab Emirates, DIDxchange, a service of Super Technologies, inc., announced its latest update to the world's largest number of service providers peering to buy and/or sell direct inward dialing phone numbers, now all USA and also UK area of +44 7 DIDs are available with incoming SMS.
Incorporated in Pensacola, Florida, USA in 1999, the company specializes in wholesale and hosted for rebrand direct inward dialing and enhanced services such as DIDXchange and CFMS (call forward management system).
"In many areas of Asia, Middle East, Africa and Latin America, we have new and strong carriers selling direct inward dialing phone numbers as well as some of the most exciting voIP startups buying.
It enables all active members of the wholesale direct inward dialing ecosystem to forward calls to not only session initiation protocol and IAX2 on most Windows, Linux and Mac computers and netbooks, smart phones, and other Internet devices.
"Super Technologies continues to be a leading provider of wholesale and resale of direct inward dialing and call forwarding with a delightful mix of social networking.

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