Nortel Networks NN43001-314 - Manual (Page 131)

Description 131
5. The call is routed over the PSTN/MCDN to the telephone at the Branch
Office.
With the ALTPrefix digits inserted, the resulting number must be one that
CDP or VNR software can process as a steering code.
For SRGs, the main office manipulates the digits in the call into a format
appropriate for routing from the SRG on PSTN/MCDN trunks. For more
information on SRG, refer to Main Office Configuration for Survivable
Remote Gateway 50 Configuration Guide (NN43001-307).
The steering code allows the call to be translated and referenced to a Route
List Index from which the system chooses the alternate route. The digit
manipulation capability of CDP allows digits (such as the ALTPrefix) to be
deleted and it can insert digits so the resulting number is appropriate for
the alternate route choice selected (PSTN or MCDN). For example, you can
manipulate the digits for PSTN routes so that DID destinations are dialable.
Dialing plans
Consider the many ways that calls can be dialed in a network. A
station-to-station call can be dialed using the following:
• Directory Number (DN)
• Coordinated Dialing Plan DN (starting with a Local Steering Code or
Distant Steering Code)
• Uniform Dialing Plan DN (starting with a Location Code or Home
Location Code)
• Transferable DN (TNDN) or Group Dialing Plan DN
Main offices and branch offices must be able to translate the calls, after the
ALTPrefix is inserted, using CDP or VNR. Take into account the format of
the calls with an ALTPrefix inserted prior to the rest of the digits.
Before deciding whether to program the steering codes as Distant Steering
Codes (DSC) or Trunk Steering Codes (TSC), take into account that the
system counts the digits in calls that start with a DSC.
Without Flexible Numbering Plan (FNP), DSC calls must have the same
number of digits as specified in LD 86 ESN (the NCDP prompt). With FNP,
fewer digits are acceptable, if the FLEN prompt is programmed correctly.
The maximum length of a CDP DN is seven digits (if DNXP is not equipped),
and ten digits, if DNXP is equipped. For more information refer to Dialing
Plans Reference (NN43001-283).
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.