Switch User's Guide

Planning for CSX400 ISDN Configuration
CSX400 and CSX400-DC User’s Guide 31
ISDN Line Information
You need to know the telephone switch type and phone numbers associated with the ISDN line.
The telephone switch types supported are listed in Telephone Switch Support. The service
provider gives you up to three sets of numbers for identifying the ISDN line and attached devices.
You may be assigned none, one or two SPIDs or DNs and this varies by service provider and
country.
Phone Numbers — Numbers used for others to dial into the ISDN B channels on your ISDN line
(similar to analog line phone numbers).
Directory Numbers — Address assigned by the ISDN service provider for each device operating
on the line. This number can be similar to the phone number. The Directory Number is not
generally implemented outside the U.S.
Service Profile Identifications — SPIDs, also assigned by the ISDN service provider, identify
the services and features that the switch provides to the ISDN device. Commonly implemented in
the U.S. and Canada, the SPID is often derived from the directory number, combined in a series
with other digits as shown in the example in Figure 4. SPIDs are not generally implemented
outside of the U.S. and Canada.
Figure 4 Service Profile Identifications (SPIDs)
Refer to Chapter 3, ISDN Line Ordering and Configuration, for further information about
ISDN configurations and line ordering.
CSX400
EXAMPLES:
NORTHERN TELECOM DMS-100 SWITCH
DNs = 5551001, 5551002
SPIDs = 41555510011, 41555510022 OR
415555100101, 415555100202
AT&T 5ESS
POINT-POINT MODE: NO SPIDs
MULTI-POINT MODE: SPID = 0155510010 OR
SPIDs = 01555100100, 01555100200
PHONE NUMBER 555-1002
PHONE NUMBER 555-1001 ISDN B CHANNEL
ISDN B CHANNEL
CENTRAL OFFICE SWITCH
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