Instruction manual

Reliability and survivability
555-233-767166 Issue 4 May 2003
An LSP is a configuration used to provide redundancy of the Avaya call
processing application. Usually, a media module serves as the ICC for the system,
but it can also serve as a redundant processor for call processing. In the LSP
configuration, the processor serves as an alternate controller/gatekeeper for
IP entities, such as IP telephones and media gateways. These IP entities use the
LSP when they lose connectivity to their primary controller.
In the event that the communication link is broken between the remote Avaya
G700 Media Gateway and the primary call controller (either an Avaya S8300
Server or an Avaya S8700 Server), the LSP provides service for the Avaya IP
telephones and Avaya G700 Media Gateways that were controlled by the primary
call controller.
How the Avaya G700 Gateways and IP endpoints change control from the
primary to the LSP is driven by the endpoints themselves, using a list of call
controllers. During initialization, each IP endpoint and Avaya G700 Gateway
receives a list of call controllers. The IP endpoints ask each call controller in the
list for service until one responds with a positive reply. If the link to that call
controller fails at some later time, the endpoint will try to receive service from the
other call controllers in the list, including the LSP.
The LSP provides service to all Avaya G700 Gateways and IP endpoints that
register with it. When the primary call controller is prepared to provide service,
the LSP is reset. This informs the IP endpoints to try their call controller list again,
and returns to the primary call controller for service.
The LSP provides redundancy in a variety of configurations, and can be located
anywhere in a network of Avaya G700 Gateways.
LSP supports up to fifty G700 Media Gateways
Communication Manager allows for a single LSP to support up to fifty (50) G700
Media Gateways in an S8700 Media Server ECC configuration.
Support for ten LSPs on S8300 Media Servers
On S8300 Media Server configurations, Communication Manager supports up to
ten (10) LSPs.
Support for up to fifty LSPs
Communication Manager supports up to fifty (50) LSPs in a single system
configuration.