Avaya B5800 Bedienungsanleitung Seite 202

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SIP controller monitoring
It is important to understand that both the B5800 Branch Gateway system and the survivable
extensions perform monitoring of the Avaya Aura
®
Session Manager availability.
• The monitoring done by each survivable extension is used to determine when it should
failover to another SIP controller.
• The B5800 Branch Gateway system's monitoring is used to determine when the B5800
Branch Gateway system should allow survivable extensions to register with it.
The sections below summarize this monitoring in more detail.
B5800 Branch Gateway system line monitoring
The B5800 Branch Gateway system sends regular OPTION messages to any Avaya Aura
®
Session Manager lines in its configuration. The Proactive and Reactive settings on the B5800
Branch Gateway system's System tab set how often the OPTION messages are sent in
seconds. The Proactive setting is used for an Avaya Aura
®
Session Manager line currently
thought to be in service. The Reactive setting is used for an Avaya Aura
®
Session Manager
line currently thought to be out of service.
• If a response is received and is not a 408, 500, 503 or 504 response, the Avaya Aura
®
Session Manager line is treated as in service; otherwise the line is treated as being out
of service.
If no response is received within the set Call Initiation Timeout setting on the Avaya Aura
®
Session Manager line's VoIP tab the line is treated as being out of service.
• If the line is out of service, and call comes from the trunk, the trunks status is changed
back to in service.
• If the line is in service, a call may fail due to either being unable to deliver the message
or receive a 100 response within a configured timeout. The line will not go out of service
because this may be a temporary failure due to a busy system.
• In addition each Avaya Aura
®
Session Manager line can be manually set to in or out of
service using the In Service option on the Avaya Aura
®
Session Manager line's Session
Manager tab.
Centralized 9600 extension SIP controller monitoring and selection
Each survivable extension performs monitoring to determine which SIP controllers are
available and, from the results, which controller to use as its active controller. It does this as
follows:
Using the list of SIP controllers, the extension send a SIP REGISTER (Adding bindings)
message to each controller. The controller list is set by the SIP_CONTROLLER_LIST
which lists controllers in priority order from highest priority first.
The phone waits for a response from each controller within a set time. That time is set by
the CONTROLLER_SEARCH_INTERVAL setting (default 4 seconds).
The controller is considered available if a 200 OK response is received from it within the
timer interval. Once a controller has been marked as available, the phone unregisters
Extension administration
202 Implementing the Avaya B5800 Branch Gateway November 2011
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