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Configuration
Switch Type and SPIDs In addition to the configuration the
telephone company must do at their end of your ISDN line,
there is also some configuration you must do at your end.
You need to know three pieces of information supplied by the
telephone company to make your ISDN service work:
- Switch type
- Phone numbers
- SPID(s) - Service Profile Identifier(s)
Most ISDN hardware adapters need to know what type of switch
they are connected to. The switch type simply refers to the
brand of equipment and software revision level that the telephone
company uses to provide you with ISDN service. There are only
a few types of switches in the world and usually just one
in countries other than the United States.
The second type of information is your phone number or numbers.
In some cases, each B channel on an ISDN line has its own
number, while in other cases both B channels share a single
phone number. Your telephone company will tell you how many
numbers your ISDN line will have. Separate numbers may be
useful if you plan to take incoming calls on your ISDN line.
The last type of information is the Service Profile Identifier
(SPID), which is only used in the United States and Canada.
The SPID usually consists of the phone number with some additional
digits added to the beginning and end. The SPID helps the
switch understand what kind of equipment is attached to the
line, and if there are multiple devices attached, helps route
calls to the appropriate device on the line.
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