3Com 3C10122 - NBX Business Telephone, Installation Manual, Page: 228 / 252

228 A
PPENDIX
B: C
IRCUIT
P
ROVISIONING
Recommended:
■
With 3 digit extensions 100-499, the last three digits of the
DID/DNIS codes should be 100-499.
■
With 4 digit extensions 1000-4999, the last four digits of the
DID/DNIS codes should be 1000-4999.
■
Line Hunting Sequence — 3Com recommends that the telephone
company start with channel one and hunt upward for incoming calls.
This works well with NBX systems, because they start at the highest
channel number and hunt down for outgoing calls. Verify which
services are available from the telephone company.
■
Supported Telephone Central Office Switch Protocols — NBX
system ISDN PRI services support the following central office switch
protocols:
■
AT&T 5ESS Custom
■
DMS Custom
■
National ISDN NI-1/NI-2
■
Caller ID by Name — If you configure your T1 Digital Line Card for
ISDN PRI operation, you can subscribe with your telephone service
provider for caller ID by name service, but only if your telephone
service provider uses National ISDN-2 or AT&T 5ESS Custom.
ISDN BRI
Prerequisites
Before you start to install a BRI circuit, collect all of the following
information:
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All telephone numbers to be activated
■
Circuit ID
■
Carrier’s testing department name and telephone numbers
■
Carrier’s circuit provisioning department names and numbers
■
Carrier’s account representative account information