[Freeswitch-users] Buzzing when people speak in conference

Giovanni Maruzzelli gmaruzz at celliax.org
Wed Apr 1 15:10:35 PDT 2009

To make a long story short, a ground loop is when an electric circuit
is made between different audio device that are connected to the same
electric power grid with badly grounded connections.

This is an electrical problem generating noise, nothing to do with software.

To test if this is the origin of your problem, try to use the devices
unplugged from the electrical grid and check if the noise still there


Giovanni Maruzzelli
via Pierlombardo 9, 20135 Milano
gmaruzz at celliax dot org
Cell : +39-347-2665618
Fax : +39-02-87390039

2009/4/1 Stromin Normin <stormin.normin at hotmail.co.uk>:
> Cheers for the replies.  I'm not sure if I'm replying properly but here
> goes.
> I'm using Polycom 650 phones.
> I'm not really sure what a 60hz ground loop is so will need clarification,
> sorry I'm new to this.  The phones are all on the same LAN and the
> conferencing is done on internal calls.
> Cheers
> ________________________________
> From: stormin.normin at hotmail.co.uk
> To: freeswitch-users at lists.freeswitch.org
> Date: Wed, 1 Apr 2009 22:09:03 +0100
> Subject: [Freeswitch-users] Buzzing when people speak in conference
> Hi,
> I've been asked to do some testing on Freeswitch by work, we currently use
> Asterisk.  I'm quite new to telephony so please go easy.
> I have FS setup on a windows box and at the moment I'm testing internal
> calls only, when I transfer calls or call extensions everything sounds
> great.  The problem occurrs when I setup conferencing, people can log in ok
> and we can talk, the trouble is as people start to talk a buzzing sound is
> heard in the background, once the talking stops the buzzing stops.  If the
> person goes on mute there is no buzzing.
> Hopefully this is enough info cheers for any help.
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