Hardware redundancy is a proven and well defined tool for increasing the availability of a system. Avaya Critical Availability solutions has employed the symmetric (active-active) technique to achieve 99.999% availability. Consider the symmetric (active-active) configuration for deployment of redundant hardware.

Because two G450 media gateways do not share the same TDM bus, redundancy is achieved only for the media server features and not for the media gateway features. The configuration of redundancy for media server is symmetric (active/active).

It is a good practice to connect each media gateway to redundant Layer 2 switches as shown in the figure to protect each media gateway from failure of the Layer 2 switch itself.