Controller Determination And Survivability Activity - Avaya 9608 Administration

System failover and survivability
- If the selected value originated from any other source, the entire list of configured
controllers is copied and saved as if they all originated from the SIP proxy settings
screen.
To clear the values that the deskphone downloads from PPM and displays on the SIP
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proxy screen, you must clear the values on the deskphone, from Craft.
If the administrator is at the Login screen and no controller has been set, a controller can
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be set at the Craft (Local Administrative procedures) menu, as described in Installing and
Maintaining Avaya 9601/9608/9608G/9611G/9621G/9641G IP Deskphones SIP. The user
can log in successfully with a controller at this point.

Controller Determination and Survivability Activity

The deskphone performs controller determination and verification after a successful user login.
The deskphone then periodically performs failover checks. The steps are:
1. Determine controllers to monitor
The list of controllers to monitor is built from the Configured Controllers list using the
SIPREGPOLICY parameter setting as a guide. The list of SIP Proxies or Registrars can be
obtained from the network DHCP servers, the 46xxsettings file, a PPM, or configured via the
deskphone user interface. Similarly, the administrative or the automatic failback parameters and
the monitoring intervals can be obtained via the 46xxsettings file, the PPM, or the deskphone
user interface.
The priority order (highest to lowest) of the data sources used to construct the controller list is
as follows:
1. Deskphone user interface (set using SIP Craft procedure)
2. System Manager
3. Settings file (46xxsettings.txt)
4. DHCP (Option 242)
5. LLDP
The controllers received from these data sources are combined into an aggregated list. The
priority of controllers within the aggregated list is based first on the priority of the data source
and secondly on the priority of the controller within the list received from that data source. The
aggregated list has all duplicates removed. In the case where a controller is included multiple
times with different transport types, only one entry for the controller is added using the transport
type from the highest priority data source.
154 Administering Avaya 9601/9608/9608G/9611G/9621G/9641G IP Deskphones SIP
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