Avaya B5800 Bedienungsanleitung Seite 119

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The B5800 Branch Gateway system sends regular OPTION messages to both Avaya Aura
®
Session Manager lines in order to check their in-service or out-of-service status. If the current
line in use changes to out of service and the other line is in service, the B5800 Branch Gateway
will switch to using the other line. However it will not automatically switch back if the previous
line returns back to in service. The B5800 Branch Gateway system will only switch lines when
the line currently in use changes to out of service.
If all available channels of the current Avaya Aura
®
Session Manager line are in use, the B5800
Branch Gateway will not overflow calls to the other Avaya Aura
®
Session Manager line.
However, if PSTN trunk fallback has been configured, the other Avaya Aura
®
Session Manager
line will be used. See
PSTN trunk fallback on page 330 for more information.
Avaya Aura
®
Session Manager line service status checks
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 extensions
In scenarios where there are multiple Avaya Aura
®
Session Managers, centralized extensions
can be configured to use these for survivability in addition to using the local B5800 Branch
Gateway system. This is preferable as the additional Avaya Aura
®
Session Manager will be
able to provide full feature support. In this scenario, the backup Avaya Aura
®
Session Manager
used by the centralized extensions should be the same one as used for the secondary Avaya
Aura
®
Session Manager line.
Secondary Avaya Aura
®
Session Manager line configuration
The secondary Avaya Aura
®
Session Manager line is configured in the same way as the
primary Avaya Aura
®
Session Manager line. The only difference required is to set the SM
Address field to the address of the alternate Avaya Aura
®
Session Manager from the one being
used by the primary Avaya Aura
®
Session Manager line.
Administering a Session Manager line for each branch
Implementing the Avaya B5800 Branch Gateway November 2011 119
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