3Com 3C10200 NBX Installation Guide - Page 224

224 APPENDIX B: CIRCUIT PROVISIONING T1 Prerequisites All contact information must be available at time of installation, including telephone numbers and appropriate account representative contact information from the client's carrier. T1 Recommendations If the client is using standard (DS1) T1 lines, 3Com recommends that the circuits from the T1 provider meet the following criteria: ■ Framing Type - Use either ESF with B8ZS. ■ Zero Code Suppression - Use D4 with AMI. ■ Signaling - E&M/Wink is required. ■ Start Type - Wink Start is required. Some Central Offices that use a DMS 100 switch may configure T1 circuits with an option to provide outbound dial tone. This configuration does not provide a wink for outbound calls. The NBX system does not need dial tone as it provides its own. Verify that the outbound channels are configured for Wink Start. ■ Line Hunting - Obtain from the telephone company the method they use to hunt for an available channel on the T1 span. The NBX system typically searches downward from high-numbered channels when trying to place an outgoing call. If the telephone company searches upward from low-numbered channels for calls to the NBX system, conflicts are avoided. ■ Circuit Type - 4-wire is required. ■ DID Applications - When using DID or DNIS, 3Com recommends ordering telephone numbers that easily fit into the NBX system numbering plan. Although the numbering plan is extremely flexible, it is far easier to use if you have 3 or 4 digit DID\DNIS codes. This allows for a simple dial plan implementation. For 3-digit internal extensions, try to use the 100-499 range. Have the carrier provide the corresponding three digits for the DID\DNIS numbers/code. For 4-digit extensions, ask for the 1000-4999 range and request that the carrier use corresponding four digits for the DID/DNIS numbers/code. For Caller-ID type services, the carrier must support in-band ANI. For more information, see "Ordering DID (Direct Inward Dialing) Services for T1" on page 158.