December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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Chapter 11: Integrated Services Digital Network (ISDN) 375
9. A friend of mine has an ISDN connection and said that his phone numbers are
called SPIDs. Is this true?
Not really. The telephone numbers assigned to ISDN B channels have service profile
identification (SPID) numbers associated with them. SPIDs are provided by the telcos and
are usually defined by adding a prefix, a suffix, or both (it depends on the telco’s switch) to
an assigned telephone number. For example, assume the number assigned to a B channel is
4075551469. If the telco uses a prefix of 05 then the SPID is 054075551469. SPIDs are
used to identify the various processes of an ISDN device. ...
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