Adding An Isdn Bri-St Digital Line Card - 3Com SuperStack 3 NBX Administrator's Manual

240 C 3: D
HAPTER EVICE
Adding an ISDN
BRI-ST Digital Line
Card
C
ONFIGURATION
To add an ISDN BRI-ST Digital Line Card to an NBX system, use the
information in these sections:
Preparing the NBX System for BRI Cards
■
Ordering DID, CLIP, and MSN Services for BRI
■
Inserting the ISDN BRI-ST Digital Line Card
■
Preparing the NBX System for BRI Cards
Before you insert the BRI-ST Digital Line Card into the chassis, order an
ISDN BRI-ST line from your telephone carrier, and have them install the
line.
Ordering DID, CLIP, and MSN Services for BRI
When you order BRI services with DID, CLIP, or MSN, the local telephone
carrier assigns a block of telephone numbers to you. Usually, you can
request a specific range of numbers, but sometimes the carrier assigns
numbers other than the ones you request.
You may be able to request that the local telephone carrier pass you a
specific number of digits for each incoming telephone call. Sometimes
the carrier does not offer any choice. In either situation, you need to
know how many digits the carrier passes.
Example: Carriers commonly pass either the last three digits or last four
digits of the number for each incoming call.
Sometimes the last digits of the telephone numbers the carrier assigns to
you do not match the telephone extension numbers you want to use for
internal calls. Create entries in your Dial Plan configuration file to trans-
late the incoming numbers into the corresponding extension numbers.
Example: You want to use internal extensions from 4000 through 4999,
but the local telephone carrier assigns you numbers from 617-555-3500
through 617-555-4499. You can create translator entries in the Dial Plan
configuration file to translate an incoming digit sequence such as 3795
into extension number 4295, and a sequence such as 4213 into 4713.
The configuration would require several translator entries to handle
subsets of the total range. A unique set of entries would handle incoming
digit sequences from 3500 through 3599, from 3600 through 3699, and
each of the other sequences in which the first two digits were unique in
the range from 37XX through 44XX.