ISDN Protocol Administrator's and Developer's Guide ... - Intervoice

DLL (Dynamic Link Library)A program module that is linked and loaded in runtime. For aWindows-based system, program segments are stored away fromthe main .exe program in files with .dll extensions. Use of DLLsdecreases the required size of the main program. DLLs can beshared among many programs.DNIS (Dialed Number Identification Service)The digits received at the beginning of a call indicating the numberthat the caller dialed. For example, if a company has several 800numbers for various departments and the numbers come in on onetrunk, DNIS enables the ACD or switch to route the call to thecorrect department by identifying the initial digits.DPNSS 1 (Digital Private Network Signalling System 1)A British standard in which PBXs from different manufacturers canbe connected with E1 lines then transparently pass calls betweenthemselves. DPNSS 1 is the predecessor of ISDN, and is primarilyused in the United Kingdom. See QSIG or Euro-ISDN.DTE (data terminating equipment)The data interface offered by terminal equipment.DTMF (dual tone multi-frequency)A combination of a high-frequency tone and a low-frequency tonecreated when a key on a telephone keypad is pressed. DTMF tonesare used for touchtone dialing and for selecting choices from aninteractive menu presented through the telephone system. See alsorotary dialing.E1A digital transmission link used by European and other CEPTcarriers; the rate these carriers use to transmit thirty 64-kbps digitalchannels for voice or data calls, plus a 64-kbps channel for signalingand a 64-kbps channel for framing and maintenance. The UnitedStates, Canada, and several other countries use T1. See also T1.ECMA (European Computer Manufacturers Association)An international association based in Europe. It is responsible withstandardizing computer information and computer systems.ETSI (European Telecommunication Standards Institute)The European version of ANSI (American National StandardsInstitute). The organization’s main purpose is to establish standardsfor users, manufacturers and suppliers of all European members’telecommunications goods.Glossary-4 ISDN Protocol Administrator’s and Developer’s Guide 60001262, First Edition