Avaya B5800 User Manual Page 152

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Avaya Aura
®
Session Manager line redundancy
In an Avaya Aura
®
network that includes multiple Avaya Aura
®
Session Managers for
redundancy, the B5800 Branch Gateway system can be configured with a secondary Avaya
Aura
®
Session Manager line. If for any reason the B5800 Branch Gateway system's primary
Avaya Aura
®
Session Manager line goes out of service, the system will automatically attempt
to use the secondary Avaya Aura
®
Session Manager line. Prioritization of the Session Manager
lines is determined by the line number configured for a particular Session Manager line. For
example, if the first Session Manager line is configured with line number 17 and the second
Session Manager line is configured with line number 18, then line number 17 has the higher
priority and is considered the primary Session Manager line. If for some reason you want to
designate the secondary Session Manager line as the primary line, you must change one or
both of the line numbers associated with the Session Manager lines so that the secondary
Session Manager line number is lower than that of the primary line.
The redundancy operation of the Session Manager lines is based on line prioritization. The
active line to which B5800 Branch Gateway sends all calls is always the highest priority Session
Manager line in service. If the primary Session Manager line is in service, it is the active line
for sending calls. If the connection to the primary Session Manager line is lost, causing B5800
Branch Gateway to switch to the secondary Session Manager line, when the primary line
comes back up, B5800 Branch Gateway will switch back to the primary B5800 Branch Gateway
line.
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 296 for more information.
Avaya Aura
®
Session Manager line service status checks
The B5800 Branch Gateway system sends regular SIP OPTIONS 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 SIP OPTIONS 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 32 seconds (SIP Timer F), 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.
Initial branch configuration
152 Implementing B5800 Branch Gateway for a CS 1000 Configuration October 2012
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