Nortel Networks COMMUNICATION SERVER 1000 NN43021-110 - Manual (Page 62)

62 System architecture
Branch Office
The Branch Office feature extends system features from a main office to
one or more branch offices.
A branch office is an MG 1000B Core connected to an IP PBX at the main
office over an enterprise IP network or over a WAN. This configuration
enables a secondary location to centralize the call processing of its
IP-based communications network. The Call Server at the main office
provides the call processing for the IP Phones in both the main office and
branch offices. The MG 1000B Core provides call processing functionality
to local digital telephones and analog devices. The MG 1000B Core also
provides digital and analog trunk access to the local Public Switched
Telephone Network (PSTN).
The branch office connects to the main office over Virtual Trunks on an
enterprise IP network or a WAN. The main office transmits and controls IP
Phone calls and IP network connections. If the main office fails to function,
or if there is a network outage, the MG 1000B Small System Controller
(SSC) provides service to the telephones located in the branch office. This
enables the IP Phones to survive the outage between the branch office
and the main office.
A branch office can be created as a new hardware configuration, or by
converting an existing Small System to a branch office. The functionality
is the same in both configurations.
For more information on the Branch Office feature, see Branch Office
Installation and Commissioning (NN43001-314), .
Geographic Redundancy
Geographic Redundancy enables a customer to duplicate the entire
redundant processing core of a CS 1000M SGor CS 1000M MGsystem
at a remote location, at any distance, over the customer WAN. The
duplicate core can then take over processing if the primary system fails
for any reason. Geographic Redundancy also offers automatic database
replication between main and standby systems to promote a smooth
transition. When this configuration is implemented, the customer enhances
the disaster recovery capability of the network and further secures
ultra-high reliability.
Note: Geographic Redundancy capabilities only apply to IP elements,
for example, to IP Phones and Media Gateways. Geographic
Redundancy does not apply to TDM elements.
For more information on the Geographic Redundancy feature, see System
Redundancy Fundamentals (NN43001-507), .
Nortel Communication Server 1000
Communication Server 1000M and Meridian 1 Large System Overview
NN43021-110 02.05 Standard
30 September 2008
Copyright © 2003-2008 Nortel Networks
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