3Com 3C10200 NBX Installation Guide - Page 226

226 APPENDIX B: CIRCUIT PROVISIONING ISDN BRI Prerequisites 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. Before you start to install a BRI circuit, collect all of the following information: ■ 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