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Reliability and Recovery
274 Avaya Application Solutions IP Telephony Deployment Guide
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
keep-alive messages to the primary server). The first registration request with the primary
server will set up encryption on TCP link for H.248 messages. The MG will keep LSP
registration until MG is accepted by primary server. Once registered with primary, Media
Gateway will drop LSP link. Once all Media Gateways have migrated form LSP, LSP will
un-register all IP end points, which automatically will re-register with primary server.
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, ISDN-PRI trunks, calls between gateways, IGAR, and previously
connection-preserved calls.
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 IP-IP calls are preserved.