One of the controls is in the 46xxsettings.txt file:
################## USB POWER SETTINGS #########################
##
## USBPOWER parameter is not supported by SIP phones.
##
## USB Power Control
## This defines a Control parameter to Power the USB interface.
## The values are as follows and the default value is 2.
## 0: Turn off USB power regardless of power source.
## 1: Turn on USB power only if Aux powered.
## 2: Turn on USB power regardless of power source.
## 3: Turn on USB power if Aux powered or PoE Class 3 power.
##
## SET USBPOWER 2
##
A USB device can be used to carry information to support the following usage profiles:
- Mobility/Visiting User: The USB memory stick carries login credentials, contacts and/or digital pictures. Inserting a USB device will cause the phone to register with a login profile, allowing any 9600 Series IP telephone to become a personalized extension.
- Deskphone Personalization: A USB memory stick supports import/export of contacts to/from a 9600 Series IP Telephone and/or display of digital pictures.
- As of Software Release 3.0, one or more pictures from a USB flash drive device can be used as screen savers. The USB device may contain any number of .jpg or .jpeg files that can be used in place of a default or custom screen saver(s).
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