Planning for CSX400 ISDN ConfigurationCSX400 and CSX400-DC User’s Guide 31ISDN Line InformationYou 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 serviceprovider 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 andcountry.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 operatingon the line. This number can be similar to the phone number. The Directory Number is notgenerally implemented outside the U.S.Service Profile Identifications — SPIDs, also assigned by the ISDN service provider, identifythe services and features that the switch provides to the ISDN device. Commonly implemented inthe U.S. and Canada, the SPID is often derived from the directory number, combined in a serieswith other digits as shown in the example in Figure 4. SPIDs are not generally implementedoutside of the U.S. and Canada.Figure 4 Service Profile Identifications (SPIDs)Refer to Chapter 3, ISDN Line Ordering and Configuration, for further information aboutISDN configurations and line ordering.CSX400EXAMPLES:NORTHERN TELECOM DMS-100 SWITCHDNs = 5551001, 5551002SPIDs = 41555510011, 41555510022 OR415555100101, 415555100202AT&T 5ESSPOINT-POINT MODE: NO SPIDsMULTI-POINT MODE: SPID = 0155510010 ORSPIDs = 01555100100, 01555100200PHONE NUMBER 555-1002PHONE NUMBER 555-1001 ISDN B CHANNELISDN B CHANNELCENTRAL OFFICE SWITCH194409
