Nortel Networks 1000M User Manual
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Survivability
Configuring trunks for Survivability
When properly configured, the IP Expansion Cabinets or Chassis can make
outgoing calls and, in some cases, receive incoming calls when in survival
mode.
In order to make or receive calls, the survivable cabinet or chassis must be
configured with the appropriate trunks. The sections below detail some
examples of configuration options that may or may not suit your specific
system setup.
Option 1: Dedicated DID/DOD trunks
Procedure 56
Configuring dedicated DID/DOD trunks for Survivability
Step
Action
1
Configure each IP Expansion Cabinet or Chassis with incoming and
outgoing DID trunks.
2
Configure the Main Cabinet or Chassis with incoming and outgoing
CO trunks.
These Central Office (CO) trunks will handle most external calls.
The DID trunks not only provide direct inward access for certain
users, but they also provide a means of outward dialing for users of
the IP Expansion Cabinets or Chassis in survival mode. They can
also be programmed as outgoing overflow trunks for the CO trunks
in normal mode. Ensure that the CO has configured the DID trunks
to work in this mode.
3
Use the Network Alternate Route Selection (NARS), Basic Alternate
Route Selection (BARS), or Alternate Trunk Route (STEP) prompt
in LD 16 to program the CO trunks as outgoing overflow trunks in
normal mode.
Example: In survival mode, incoming calls (non-DID) are still
directed to the main cabinet by the CO trunks. If the called non-DID
DN exists in an expansion cabinet currently in survival mode, the
call is intercepted since it cannot be completed to its intended
destination. The call is then given the intercept treatment that is
configured for Maintenance Busy Numbers (MBNR) in the Customer
Data Block. The options are busy tone, overflow tone, transfer to
attendant, recorded announcement, or voice mail. If the intercept
treatment is "Mail", then the call is transferred to the called person’s
voicemail, such as Meridian Mail or CallPilot. The users of the IP
expansion cabinets that are in survival mode can detect that they
are in survival mode by the Flexible Survivable Dial Tone and "Local
mode" display on their telephones.
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Small System Installation and Commissioning
NN43011-310
01.04
Standard
Release 5.0
13 May 2008
Copyright © 2008, Nortel Networks
.