3Com 3C10111C - NBX 100 - Modular Exp Base, Руководство по установке

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134 C
HAPTER
6: BRI-ST D
IGITAL
L
INE
C
ARD
Adding a BRI-ST
Digital Line Card
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 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 it.
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. 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 case, 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. You can create entries in your Dial Plan file to translate 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.
If the DDI/DID numbers match your internal extension numbers, the
translator entries in your Dial Plan configuration file can be much simpler.
Example: You plan to use internal extensions from 100 through 299,
and the local telephone company assigns you numbers from