Nortel Networks NN43001-314 - Manual (Page 292)

292 Dialing plan configuration
This section primarily describes the configuration of a dialing plan for off-net
calls from MG 1000B IP Phones in Normal Mode. However, the procedures
in this chapter are also applicable when configuring on-net UDP dialing for
these telephones, if a single Access Code is used for both UDP and some
or all off-net calls.
Introduction
The Branch Office feature is versatile enough to provide solutions for a wide
variety of applications which require different dialing plans. Therefore, an
effective dialing plan is critical for the successful deployment of a Branch
Office.
Nortel recommends that the call type sent to the Virtual Trunk is not a Public
Number. That is, the number should stay in the Private/Special Number
domain. This avoids any future conflict with any future Public Number, which
is out of the PBX administrator’s control.
Dialing plans
When a number is dialed, the Call Server determines whether the called
number is internal or external to the Branch Office. If internal, the system
terminates the call on the appropriate terminal. If external, the system
routes the call in one of two ways:
• Uniform Dialing Plan (UDP) or Coordinated Dialing Plan (CDP) routes
the call to the proper trunk group.
• Vacant Number Routing (VNR) routes the call to a Virtual Trunk.
Once the call is sent over the IP network, the call is routed to the MG 1000B
Core, which uses the Network Routing Service (NRS) to route the call. In a
SIP network, the Redirect Server translates the address from a telephone
number to a SIP URI, and authorizes the call. In an H.323 network, the
H.323 Gatekeeper translates the address from a telephone number to an
IP address, and authorizes the call.
Specific dialing plan configuration is required for IP Phones to properly
select a main office or Branch Office that provides access to the PSTN for
the originating IP Phone. A common configuration might be:
• Branch Users select the MG 1000B PSTN for local calls.
• Main office users select the main office PSTN for local calls.
• All users select either the main office or MG 1000B PSTN for
long-distance calls to minimize toll charges.
However, this configuration represents only one way that the dialing plan
could be configured. PSTN calls can be routed according to the point of
origin (main office or Branch Office) and/or the desired destination, and can
Nortel Communication Server 1000
Branch Office Installation and Commissioning
NN43001-314 01.02 Standard
Release 5.0 20 June 2007
Copyright © 2007, Nortel Networks
.