Hi
Try this and see if it helps
1. Make sure that the devices are correctly grounded.
2. Check the speed/duplex setting on the remote end of the connection.
3. Perform a shutdown and no shutdown on interface
4. If the error message continues: There are several know bugs related to this message such as CSCeb24148.
5. Is it the only phone type or same phone types are connected to same switch.
If possible, post the model and IOS version of the device to further analysis.
HTH
Hitesh Vinzoda
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