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 ?
The TAPI interface allows direct dialing of contacts in Outlook and other TAPI compatible applications.
It removes the need for most direct dialing (as much as 90%) and thus virtually eliminates telephone tag.
Canada, Australia, and New Zealand, and delivers digitized voice messages accurately, rapidly, and at far lower cost than with direct dialing.
Because it allows people to communicate back and forth without telephone tag, without regard to time zone differences and at far lower cost than direct dialing, we expect widespread use.
It removes the need for most direct dialing (as much as 90 percent) and thus virtually eliminates telephone tag.
23, 1994--LDDS Communications, one of the four largest long distance companies in the United States, announced Wednesday that it will offer direct dialing to Cuba beginning Friday, Nov.
In addition to very affordable rates, LDDS will provide a complete line of services including international direct dialing to more than 220 countries and will offer competitive rates to Latin America; bilingual operator assistance and customer service; the innovative OnLine(sm) calling card, Home Advantage(sm) and Homebound 800(sm) residential services; an attractive collection of prepaid calling cards; and other long distance services to facilitate calling to Cuba.
17, 1994--LDDS Communications, one of the four largest long distance companies in the United States, announced Thursday that it will offer direct dialing to Cuba beginning as early as next week.