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2003 Avaya Inc. All Rights Reserved.
Page 9 of 12
Local Survivable Processor S8300.doc
Once the Avaya G700 Gateway makes contact with a gatekeeper, the MGP then
undergoes a reboot, which takes approximately 40 seconds. This reboot is necessary to
put the call states on the G700 Gateway in synch with the call states on the new
gatekeeper.
Following the reboot, the search starts again at the beginning of the list. This allows the
G700 the best chance to be registered with the primary gatekeeper, especially after a
short network outage when the primary gatekeeper is still able to provide service and the
link between the G700 and the primary gatekeeper has been restored.
Using the defaults of one-minute primary search time, a transition point of one, a
total search time of 30 minutes, and one CLAN and one LSP with a network failure, here
are the times involved in the Avaya G700 Gateway failover to an LSP:
Keep-alive failure : 72 seconds
(first) Search time attempt to the CLAN : 10 seconds
Connect to LSP : ~1 second (can be up to 10 seconds)
MGP reboot : 40 seconds
(second) Search time attempt to the CLAN: 10 seconds
Reconnect to LSP : ~1 second (can be up to 10 seconds)
Until the Avaya G700 Gateway reaches a second gatekeeper, all calls in progress will
remain up, but without access to features. Any call that is attempted when the gateway is
in its recovery stage will receive no dial tone until the G700 Gateway re-registers with a
gatekeeper and is receiving call processing again. After the G700 reaches a second
gatekeeper, the MGP resets and any DCP, analog, or trunked calls in progress at this time
are torn down.
8.2 IP Telephone
Any IP-direct calls (In network - IP endpoint to IP endpoint) will stay up until
both parties hang up, but will have no access to any features until a new call is originated.
The telephone will enter into recovery mode when the users hang up. The LSP will deny
IP phone registrations until at least one G700 has registered with the LSP. Until the
G700 has registered, the LSP has no access to IP resources to serve the telephones, so this
is a precautionary measure to ensure the highest quality of service once the transition to
the LSP has occurred.
Once the primary call controller is ready to serve the endpoints being served by
the LSP, the LSP must undergo a manual reset, and the endpoints will re-register with the
primary call controller once again. A discussion about returning control to the main
gatekeeper and recommendations is included later in this paper.
9. Communication
Any LSP that controls an Avaya G700 Gateway with a trunk, either to the PSTN
or to other call controllers, will have access to that trunk. This is important because once
LSPs are giving service to G700 Gateways and IP telephones, each LSP is its own switch
and has no communication paths to other LSPs. Thus, a DCP phone on LSP1 can call a
DCP phone on LSP2 through PSTN trunks maintained in each LSP. The same rule