Cabletron Systems CyberSWITCH CSX101, User'S Information Manual

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ISDN Line Ordering and Configuration
4 CyberSWITCH 100 Advanced User Information
SPIDs, Directory Numbers and Telephone Numbers
The service provider gives you up to three sets of numbers for identifying the ISDN line and
devices. You may be assigned none, one, or two Service Profile Identifier numbers (SPIDs) or
Directory Numbers (DNs) depending on the service provider and country.
Directory Numbers
A Directory Number (DN) is the phone number of your ISDN line, assigned by your telephone
company. Some digital central office switches (AT&T 5ESS Custom) require only a single DN
Number for your CSX100. Others, like the AT&T 5ESS with the NT1 service, or the Northern
Telecom DMS-100 with the NT1 service, require a separate number for each B channel.
Service Profile Identifiers
SPIDs, also assigned by the ISDN service provider, identify the services and features that the
telephone company switch provides for your ISDN line. Commonly implemented in the U.S. and
Canada, the SPID is often derived from the directory number, combined in a series with other
digits. SPIDs are not generally implemented outside the U.S. and Canada.