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Small to mid-size enterprise
Issue 6 January 2008 43
S8300 as an LSP
The S8300 Server installed in a G700, G450, G350, or G250 Media Gateway can be configured
as a Local Survivable Processor (LSP). The LSP provides survivability when the primary
controller, either an S8300 ICC or an S8700-series External Communications Controller (ECC),
is inaccessible. Each system can have multiple LSPs. Each LSP has a copy of the primary
controller’s translations. The translations are updated regularly from the primary controller by
way of a virtual link through an IP network. Typically, all LSPs are in idle mode, where the LSPs
are not processing any calls. When the Media Gateway's Processor (MGP) or individual IP
endpoints perceive the primary controller to be unreachable, the MGP or the IP endpoints
attempt to register with an LSP. The LSP does not actively take over when the primary controller
becomes unreachable, but waits for MGPs and IP endpoints to register with it. Each LSP runs in
license-normal mode until IP Telephones or MGPs register with it, which triggers the LSP to
move into a license-error mode. Each LSP can run in active mode for a maximum of 10 days
per outage before it must be reset manually.
Based on administration of Communication Manager, the G700/G450/G350/G250 LSP can
return control of the G700/G450/G350/G250 Media Gateway to the primary controller (server)
automatically when the connection is restored between the media gateway and the primary
controller. By returning control of the media gateways to the primary controller automatically,
Communication Manager software easily and quickly eliminates the fragmentation between
remote gateways in the network created by LAN/WAN communication failures with the primary
controller. The fall-back from the LSP to the primary controller may also be manual using a reset
on the LSP. This reset breaks the communication between the LSP and each registered
endpoint. This break causes the endpoints to register with the primary controller. However, most
active calls are preserved.
Note:
Note: The S8500 can also be configured as an LSP.
G450 Media Gateway
For additional information on the G450, see Overview for the Avaya G450 Media Gateway,
03-602058.
The Avaya G450 Media Gateway is a multipurpose media gateway that can be deployed in
medium- to large-sized branch locations or in wiring closets servicing buildings and floors, in a
campus environment. It works in conjunction with Avaya Communication Manager IP telephony
software running on Avaya S8xxx Servers to deliver intelligent communications to enterprises of
all sizes.
The G450 combines telephone exchange and data networking, by providing PSTN toll bypass
and routing data and VoIP traffic over the WAN. The G450 features a VoIP engine, an optional
WAN router, and Ethernet LAN connectivity. The G450 provides full support for Avaya IP and
digital telephones, as well as analog devices such as modems, fax machines, and telephones.