To me sounds like an electrical interference. I assume you're not using
PoE. Try plugging the phone to someplace else and see if the noise
still appears.
Use wifi and battery powered cellphones with SIP clients to rule out
- pbx
- parts of the wired network
To confirm it's an electrical interference, try to schedule an
out-of-hours test when you switch off all PCs, fridge, whatever you may
have in the office. I'm guessing the buzzing sound will not be present.
Start switching PCs on one by one while listening, the buzzing sound
will return at a certain power consumer device, or after having a
certain number switched on.
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