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Re: SPID and portmaster 2 BRI.

  • From: Fade
  • Date: Wed Jun 10 01:06:01 1998


Here is a brief explanation of SPIDs taken from an email I saved long long
ago.  Hope it helps...


There's not much to it. Simply put, SPIDs identify to the phone company
what types of services and features are supported for a given device. 
SPIDs are optional in the ISDN standard, but usually required in North 
America.   As I said above, SPIDs are usually 12 digit numbers consisting
of the area code, 7 digit number and some trailing 0s and/or 1s.  For 
example: 408 555 1212 00).  The DN (Direct Number) is simply the "normal"
7 digit phone number.  For example: 555 1212.  

There are three switch types the LS-ISDN and NI2B Dual-BRI card support:  
AT&T 5ESS, Northern Telecom DMS100 and National ISDN-1 (NI1).  If a ISDN 
service provider is using an AT&T 5ESS with a software revision lower than 
5E8, then most likely the 5E can not support NI1.  In this case, SPIDs are 
not required.  However, if they have the 5E set-up for NI1, they will 
tell you to set up your equipment for NI1 and they will provide SPIDs and
DNs.  Same for the DMS-100...expect that SPIDs and DNs are usually always
required for the DMS-100, regardless if the switch is setup for NI1 or

A good ISDN home page on the Web is:


Hope this is helpful.

Jim Tremolini
Senior Systems Engineer
Telebit Corporation

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