Polycom G7500 Reference Manual page 90

Software Update Parameters
If you've configured automatic software updates (upgrade.auto.enable="1"), you can specify
how often (in seconds) your system checks with RealPresence Resource Manager to see if
there's a new update to download. The default value "3600" means your system checks for
updates once every hour.
Doing either of the following turns this feature off:
Disable provisioning (you can do this only in the system web interface).
Enable an automatic update maintenance window by setting
upgrade.auto.timeFrame.enable="1". (The maintenance window takes priority over automatic
polling.)
Integer > 300
3600 (default)
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