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Survivability for branch office media gateways
Issue 6 January 2008 273
In the event of a WAN failure, any IP telephone or media gateway that cannot reach the primary
controlling server can register with an LSP controller in survivable mode. In the S8700/G700/
G350 configuration, up to 50 LSPs are available and ready for the fail-over process. The LSP,
an S8300 or S8500 Server running Avaya Communication Manager software, is always ready
to acknowledge service requests from IP telephones and gateways that can no longer
communicate with their main controller. Once the phones and the gateway are registered, end
users at the remote site have full feature functionality. This failover process usually takes less
than 5 minutes. After failover, the remote system is stable and autonomous.
S8300/G700/G350 configuration
In this configuration, the connectivity path between the G700 or G350 Media Gateway and the
S8300 Server is:
Endpoint <=> IP Network <=> S8300 Server
The link failure discovery and recovery process is the same as above, except there are no
C-LAN addresses in the alternate gatekeeper list. In the S8300/G700/G350 configuration, up to
10 LSPs can back up the media gateways that are controlled by the S8300 Server.
Modem dial-up backup
Modem Dial-up Backup feature provides an alternative backup path to the Enterprise
headquarters, in order to maintain the control channel between the remote site and the Avaya
Communication Manager in the event of main WAN failure. This feature is defined as backup
interface for the primary interface for the WAN connectivity. During the switch over calls will not
drop.
This feature is supported in G250, G250-BRI and in G350 H.248 Media Gateways. The dial-up
back up feature and the remote router can be configured to re-establish connectivity to the main
Communication Manager before the gateway or the IP phones switch over to the LSP. This
feature supports dial-up to an ISP, in which case requires use of IPSec-VPN tunnel to the main
site.
Auto fallback to primary Communication Manager for H.248 media
gateways
This feature allows an H.248 media gateway being served by a Local Survivable Processor
(LSP) to automatically return to its primary gatekeeper. This feature is connection preserving;
that is, stable bearer connections will not drop during this process.