Nortel Networks NN43021-110 manual Branch Office, Geographic Redundancy

62System 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

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