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Reliability and Recovery
Remote IP Telephony and Media Gateway Survivability
Because WAN links can become unstable and "flap" up and down under certain failure
scenarios, Avaya Communication Manager leaves it up to the network administrators to
determine when the WAN is stable enough to support remote-site telephony needs instead of
attempting to have the gateways and endpoints re-register every time the network comes back
up, and consequently incapacitate telephony at the remote sites. Once network administrators
are confident that the WAN links are fully restored they can gracefully re-instate the original
configuration -- all it takes is issuing a single command on the LSP. Upon issuing the command,
the IP telephones and media gateways will be forced to switch back to their original
gatekeepers. The process of "switching back" can take under 3 minutes. Using Avaya Site
Administration, this task could even be automated and run at times when user impact would be
minimized. With the SNMP tools that Avaya provides, appropriate personnel could be alerted in
case of a failure.
The ability of IP telephones and G700/G350 gateways to use a number of different alternate
gatekeepers is especially relevant in case of a partial network outage. Depending on the nature
of the outage, it may be advantageous to have IP telephones and gateways register to an LSP
that is not geographically local. In that case, by re-ordering the alternate gatekeeper list,
administrators could have the endpoints and gateways register with a regional site, rather than
be forced to register locally.
254 Avaya Application Solutions IP Telephony Deployment Guide
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