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Cisco Bug: CSCte41121 - 99xx IP Phone shows error message "Unable to provide power to device"

Last Modified

Mar 16, 2010

Products (1)

  • Cisco Unified IP Phone 7900 Series

Known Affected Releases


Description (partial)


When connecting the wireless USB-headset Plantronics CS50-USB to a 9971 IP Phone, the IP Phone gives an error message: "Unable to provide power to device". Although the USB headset has an own power supply.


The IP Phone works with PoE and without Power Cube. Phone has a Camera connected. This problem does not occur when using GN9350
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