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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.digium.com/pipermail/asterisk-users/attachments/20140428/c0629e36/attachment.html>
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 ?crit :> 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.
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.