Direct Inward Dialing

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 telephonecompanies which allows the last 3 or 4 digits of a phonenumber to be transmitted to the destination exchange.

For example, a company could have 10 incoming lines, all withthe number 234 000. If a caller dials 234 697, the call issent to 234 000 (the company's exchange), and the digits 697are transmitted. The company's exchange then routes the callto extension 697. This gives the impression of 1000 directdial 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 anexchange at the end of the 234 000 line, a computer runningfax server software and fax modem cards uses the last threedigits to identify the recipient of the fax. This allows 1000people to have their own individual fax numbers, even thoughthere is only one 'fax machine'.

Dictionary of PC Hardware and Data Communications Terms.

单词	direct inward dialing
释义	DictionarySeedid Direct Inward Dialing 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 telephonecompanies which allows the last 3 or 4 digits of a phonenumber to be transmitted to the destination exchange. For example, a company could have 10 incoming lines, all withthe number 234 000. If a caller dials 234 697, the call issent to 234 000 (the company's exchange), and the digits 697are transmitted. The company's exchange then routes the callto extension 697. This gives the impression of 1000 directdial 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 anexchange at the end of the 234 000 line, a computer runningfax server software and fax modem cards uses the last threedigits to identify the recipient of the fax. This allows 1000people to have their own individual fax numbers, even thoughthere is only one 'fax machine'. Dictionary of PC Hardware and Data Communications Terms. AcronymsSeeDID
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