
Reliability and Recovery
The auto fallback process
While LSP is the acting call controller, the Media Gateway attempts to register with the primary server every 30 seconds or whenever there are no active calls (this signaling also acts as
This automatic migration of H.248 to primary server can be administered to happen immediately (default), or when there are no active calls, or can be scheduled for a time of a day window.
Connection preserving failover/failback for H.248 media gateways
This feature allows existing stable calls to be preserved when the media gateway fails over to another server, or LSP, or returns to its primary server. It is supported on all H.248 media gateways. It applies to failover and fallback of media gateway to or from an LSP and to or from an ESS.
During the failover/fallback process the bearer connection of stable calls are preserved. These include, analog stations and trunks, DCP stations, digital trunks, IP stations using media gateway resources,
G250 and IG550 Media Gateway standard local survivability function (SLS)
SLS is new survivable call processing engine that provides service to the media gateway when the gateway cannot reach Avaya Communication Manager. This engine is resident in the media gateway firmware and provides basic telephony functions at the branch without being registered to Avaya Communication Manager.
The SLS features are:
●Local station and outbound PSTN calling
●Inbound calls over the trunks to be delivered to available stations
●Acts as an H.323 gatekeeper for local IP phones to register (maximum of 10 IP phones can register)
●Call Detail Recording in a syslog format
During transition to survivability mode, only local