Reliability and Recovery
254 Avaya Application Solutions IP Telephony Deployment Guide
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.
Summary of Contents for Application Solutions
Page 1: ...Avaya Application Solutions IP Telephony Deployment Guide 555 245 600 Issue 3 4 1 June 2005 ...
Page 20: ...About This Book 20 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 21: ...Issue 3 4 1 June 2005 21 Section 1 Avaya Application Solutions product guide ...
Page 22: ...22 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 106: ...Call processing 106 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 124: ...Avaya LAN switching products 124 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 139: ...Issue 3 4 1 June 2005 139 Section 2 Deploying IP Telephony ...
Page 140: ...140 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 186: ...Traffic engineering 186 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 204: ...Security 204 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 228: ...Avaya Integrated Management 228 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 274: ...Reliability and Recovery 274 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 275: ...Issue 3 4 1 June 2005 275 Section 3 Getting the IP network ready for telephony ...
Page 276: ...276 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 356: ...Network recovery 356 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 366: ...Network assessment offer 366 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 367: ...Issue 3 4 1 June 2005 367 Appendixes ...
Page 368: ...Appendixes 368 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 394: ...Access list 394 Avaya Application Solutions IP Telephony Deployment Guide ...
Page 414: ...DHCP TFTP 414 Avaya Application Solutions IP Telephony Deployment Guide ...