T2XP Series Phones Experiencing Buzzing/Humming

[imfloridaguy]

I had the exact same thing happen. Out of the blue, a client calls and says they have 2 or 3 phones making this noise (exactly like you described) and don't know why. I took over two new phones to swap out, and at the last minute, decided to just swap out the handset.
PROBLEM GONE! The phone was fine, but the handset for some reason was causing the noise.

Replacement handsets are ***** enough that I just replaced them rather than doing an rma since shipping would have cost more than they were worth.

Good luck!