User's Manual

from it. B5800 Branch Gateway only responds to this request if its Avaya Aura
®
Session
Manager lines are out of service.
• If the phone does not have a current controller, it will register with the highest ranked
available controller.
• If a higher ranked controller then the extension's current active controller is available,
it will switch its active controller to the higher ranked available controller. This only
applies if the FAILBACK_POLICY is set to auto.
• While operating with its selected controller, the phone will continue monitoring the
available controllers. It does this at regular intervals set by the REGISTERWAIT
setting (default 300 seconds).
• If no response is received from any controller, the extension retries monitoring. It
does this at random intervals between 50 to 90% of the
RECOVERYREGISTERWAIT setting (default 60 seconds).
• A survivable extension can register with available extensions as follows. Whichever
method is used, only the highest ranking controller is set as its active controller.
• Register with only the active controller. This is selected by the
SIPREGPROXYPOLICY being set to alternate.
• Register with several controllers. This is selected by the SIPREGPROXYPOLICY
being set to simultaneous. The extension will register to the number of controllers
specified by the SIMULTANEOUS_REGISTRATIONS setting.
• A survivable extension will not failover to another SIP controller while it has a connected
call in progress. However, it will not be able to make or receive any additional calls while
in this state. Once the existing call is completed, the extension will failover to the other
SIP controller.
• In addition to the regular monitor checks, the extension will perform a monitoring check
when any of the following events occur:
• It does not receive a response to an INVITE it send to its active controller within a
set time. The time is set by the FAST_RESPONSE_TIMEOUT settings (default 4
seconds).
• It receives a TCP keep-alive failure or other socket error.
• If prompted by an administrator.
• If it receives an INVITE from a controller other than its active controller.
Survivable extensions
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