Direct Inward Dialing

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direct inward dialing

[də′rekt ¦in·wərd ′dīl·iŋ]
(communications)
The capability for dialing individual telephone extensions in a large organization directly from outside, without going through a central switchboard.

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.
References in periodicals archive ?
a leading provider of SIP-based Voice Over Internet Protocol (VoIP) solutions for service providers and end users worldwide, today announced the expanded availability of direct inbound dialing (DID) numbers to more than 2000 rate centers across the United States, with a total coverage of more than 185 million people (70 million households).
Direct inbound dialing (DID) is the most popular form of inbound routing and provides seamless fax delivery for almost any size organization.
Endstream Communications, LLC is a next-generation carrier providing high-quality, cost-effective telecommunications solutions including US/UK/Israel domestic interconnections, wholesale VoIP termination, wholesale residential VoIP services, direct inbound dialing (DID), toll-free origination and termination, calling card services, carrier information services, and its proprietary mobile VoIP application to carriers, enterprise customers and medium-sized businesses.
com users who currently enjoy the simplicity of instant web-based signup and access to prepaid communications services worldwide, will be provided with a wider range of enhanced services and Direct Inbound Dialing (DID) numbers and toll-free numbers (http://www.
The Netergy iPBX Server System provides complete PBX functionality: call hold, call transfer, multi-way conferencing, multi-line phone support, paging, hunt groups, voice mail (options include interactive voice response menus and automated call distribution), direct inbound dialing, and more.
InFAX enables users to send faxes via Direct Inbound Dialing (DID) technology which translates the fax into a TIFF attachment, a standard electronic file format.
23, 1996--GammaLink, a division of Dialogic Corporation and the originator of PC-to-fax technology, has introduced the CPD/220 fax board designed to support two direct inbound dialing (DID) ports and two analog ports in a single slot.

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