Nortel Networks NN43001-563 - Manual (Page 65)

Dialing plans 65
TM 3.1 or overlays in the system. With ESN configuration, the system can
route outgoing calls to the IP trunk card. Address translation allows the IP
trunk card call processing to translate the called party number to the IP
address of the terminating IP Trunk 3.01 (and later) node and to deliver calls
to the destination through the IP network.
The ITG-Pentium 24-port and Media Card 32-port trunk cards support the
following dialing plans:
• North American dialing plan
• Flexible Numbering Plan
Customer-defined Basic Automatic Route Selection (BARS) and Network
Alternate Route Selection (NARS) Access Codes are used to access the
dialing plans.
The IP Trunk 3.01 (and later) dialing plan supports a single customer per
IP Trunk 3.01 (and later) node and multiple IP Trunk 3.01 (and later) nodes
per Meridian 1/CS 1000M system. A customer can have multiple IP Trunk
3.01 (and later) nodes in a system, but each node can only support the
dialing plan of a single customer. Multiple customers will require multiple
nodes per system.
Multi-node configuration
The following example explains a possible configuration between two
Meridian 1/CS 1000M switches to achieve both resiliency into the IP network
and load balancing.
Meridian 1/CS 1000M switch A has two IP Trunk 3.01 (and later) nodes, A1
and A2, for the destination NPA 613. A Route List Block (RLB) is created, in
order to have two route entries (one for each IP Trunk 3.01 (and later) node).
If the trunks of node A1 are all in use or node A1 is down, call traffic is routed
to node A2. This provides resiliency by preventing failure of a single IP Trunk
3.01 (and later) node (for example, DCH failure or Leader subnet fails) from
completely eliminating VoIP service for a Meridian 1/CS 1000M system.
It is desirable to distribute calls to multiple nodes at a remote destination
Meridian 1/CS 1000M. The configuration of multiple dialing plan entries at
the local IP Trunk 3.01 (and later) node allows routing based on the dialed
digits.
For example, Meridian 1/CS 1000M switch B node B1 has two entries for
NPA 408 and 4085, which point to nodes A1 and A2 of Meridian 1/CS 1000M
switch A, respectively. Calls from B1 with dialed digits 408-5xx-xxxx are
routed to the IP Trunk 3.01 (and later) node A1 while all other 408-xxx-xxxx
calls are routed to IP Trunk 3.01 (and later) node A2.
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.