Nortel Networks Remote Gateway 50 User Manual
Page 133
Alternative Call Routing for Network Bandwidth Management
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Main Office Configuration for Survivable Remote Gateway 50
Configuration Guide
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: Description (553-3001-183).
Calls preceded by the ALTPrefix can be handled by the Vacant Number
Routing (VNR) feature. Use Flexible Numbering Plan (FNP) software for
this type of routing.
Examples of Alternative Call Routing for NBWM in operation
The main office systems shown in the diagrams in this chapter are CS 1000S
systems. However, this feature is supported on any CS 1000 system.
A call from a branch office telephone to a main office telephone
shows two CS 1000 systems. The system shown on the
left is a main office. The system shown on the right is a branch office. Both
systems have access to the PSTN. The Wide Area Network (WAN) is shown
in the center with a gatekeeper/Network Routing Service (NRS) that can be
co-resident with a Signaling Server. IP Phones are also shown associated with
each system. Telephone A belongs to the main office. Telephone B is a
telephone at the branch office registered to the main office. There are two
bandwidth zones indicated by the dashed line (main office zone - MO zone
and branch office zone - BO2 zone). Telephone A and the Media Gateway
belong to the MO zone. The branch office and Telephone B belong to the
BO2 zone.