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[shahidh at gmail.com]

Hi


Lately I've been having problem with the handsets on the polycom phones. The agents are complaining that the humming/buzzing can be heard on random days.


When the agents touch their computer the buzzing may increase louder or reduced. Also when they grab the handset cable, the buzzing noise is less loud and is loud again when I let it go. 


I have tried changing the handsets, problem not fixed. 


What is causing this? Is this networking issue? I have tried restarting the PBX Servers, switches, etc. Still same problem.

[fuckspam at wheres5.com]

Hello,

I'm afraid it has nothing to do with Asterisk, but bad ground loop on
your electrical installations. Solve this, and you get rid of the buzzing.


Le 28/04/2014 14:08, Shahid H a écrit :

[adamk at 3a.hu]

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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