• Failure of the proxy to respond to a SIP INVITE message within a specified time: If the phone
sends a SIP INVITE message to the proxy and the proxy does not reply within a specified
time, then there is a loss of connection. The response time is set to a default value of 5
seconds in the 46xxsettings.txt file but can be modified by using the
FAST_RESPONSE_TIMEOUT parameter. TheAvaya Aura
®
System Manager parameter,
TIMER B, takes precedence over the 46xxsettings.txt file parameter.
• Failure of the proxy to respond to a SIP registration method: After the initial registration, the
phone sends a re-registration message periodically to the proxy. If the proxy fails to respond
to the re-registration message, the phone starts a failover. The parameter REGISTERWAIT in
the 46xxsettings.txt file defines the period of re-registration. However, the Avaya Aura
®
System Manager parameter Registration Expiration Time takes precedence over the
46xxsettings.txt file parameter.
Failover to a backup proxy
When a loss of connection occurs, the phone continues the service with the secondary Session
Manager. If the secondary Session Manager is unavailable, the phone uses the survivable proxy.
Restoring the phone to the primary proxy
When the link between the phone and the primary Session Manager is restored, the phone might
re-establish communication and revert to the primary Session Manager. This process is referred to
as failback.
After a failover occurs, the phone waits for a period of time defined by the
RECOVERYREGISTERWAIT parameter and then the phone attempts to register back to the
primary proxy. You can modify the time in the Reactive Monitoring parameter on System Manager.
This parameter takes precedence over the 46xxsettings.txt file parameter. After this timer
expires, the phone attempts to connect to the primary Session Manager. If the attempt is
successful, the phone sends a new SIP registration message to the Primary Session Manager. At
this point, another timer starts that is defined by the parameter
WAIT_FOR_REGISTRATION_TIMER. If there is no response to the registration message from the
proxy by the time it expires, then it waits for the RECOVERYREGISTERWAIT time.
This process maps to the 46xxsettings.txt file parameter FAILBACK_POLICY being set to
automatic. If the parameter is set to manual, then the administrator must send a message to the
phone through System Manager to force it to re-register with the primary Session Manager.
Failover and survivability
January 2020 Installing and Administering Avaya 9601/9608/9611G/9621G/9641G/9641GS IP
Deskphones SIP 118
Comments on this document? infodev@avaya.com
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