VoIP Mailing List Archives

[stormin.normin at hotm...]

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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[msc at freeswitch.org]

2009/4/1 Stromin Normin <stormin.normin@hotmail.co.uk (stormin.normin@hotmail.co.uk)>

[anthony.minessale at g...]

the buzzing is probably a 60hz ground loop from the device that is calling in.
Try using a different outlet, a different device, or if it's a cordless device like a laptop, try it with the power cable
unplugged and only use battery to test it.  Typically there is nothing we can do being on the receiving end of such noise.


2009/4/1 Stromin Normin <stormin.normin@hotmail.co.uk (stormin.normin@hotmail.co.uk)>

[stormin.normin at hotm...]

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@hotmail.co.uk
To: freeswitch-users@lists.freeswitch.org
Date: Wed, 1 Apr 2009 22:09:03 +0100
Subject: [Freeswitch-users] Buzzing when people speak in conference

.ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Verdana;} 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.

" Upgrade to Internet Explorer 8 Optimised for MSN. " Download NowSurfing the web just got more rewarding. Download the New Internet Explorer 8

[gmaruzz at celliax.org]

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

Sincerely,

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




2009/4/1 Stromin Normin <stormin.normin@hotmail.co.uk>:

[thorhs at basis.is]

The Polycom 650 is an IP phone, so the ground loop should not apply.
Ground loops occur only in analog systems.

As to what the buzzing is, I'm not sure. I have performed tests using
Polycom 650s with out any sound artifacts. In fact the 650 audio has
been flawless in my testing.

Sorry I don't have a solution, just wanted to steer you away from a
ground-loop debugging session.

Thorhallur


Stromin Normin wrote:

[msc at freeswitch.org]

That being the case, maybe a pcap of the audio might yield some clues?

On Wed, Apr 1, 2009 at 3:34 PM, Thorhallur Sverrisson <thorhs@basis.is (thorhs@basis.is)> wrote:

[hads at nice.net.nz]

On Thu, 02 Apr 2009 11:34:30 Thorhallur Sverrisson wrote:

[chris at cloudtel.com]

Try turning off comfort noise completely in the conference profile? My 650s
sound great in conference w/ PCMU and G722

On April 1, 2009 03:10:35 pm Giovanni Maruzzelli wrote:

[sicfslist at gmail.com]

I have in a previous life seen this quite a bit with the PolyCom phones ... people tend to put their phone on the speaker on conference calls and I have seen this type of interference caused by a computer speaker and even a motorola cell phone. 

So I would first force everyone to use the handset 1st ... if that solves it then track down the guilty speaker or cell phone.

SDR

[stormin.normin at hotm...]

Thanks for taking the time to help me.

Giovanni, I assume you turn comfort noise off by setting it to 0 which I've now done. How can I tell which codecs I'm using in conference and how would I change them. The sound is ok on everything else.

Thanks again

From: stormin.normin@hotmail.co.uk
To: freeswitch-users@lists.freeswitch.org
Date: Wed, 1 Apr 2009 22:09:03 +0100
Subject: [Freeswitch-users] Buzzing when people speak in conference

.ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Verdana;} 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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[stormin.normin at hotm...]

Thanks for all your help, I finally resolved the issue by setting comfort-noise to false in the conference.conf.xml.

From: stormin.normin@hotmail.co.uk
To: freeswitch-users@lists.freeswitch.org
Date: Wed, 1 Apr 2009 22:09:03 +0100
Subject: [Freeswitch-users] Buzzing when people speak in conference

.ExternalClass .EC_hmmessage P {padding:0px;} .ExternalClass body.EC_hmmessage {font-size:10pt;font-family:Verdana;} 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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[brian at freeswitch.org]

Did it sound more like a machine gun?

/b

On Apr 3, 2009, at 9:02 AM, Stromin Normin wrote:

[msc at freeswitch.org]

On Fri, Apr 3, 2009 at 7:11 AM, Brian West <brian@freeswitch.org (brian@freeswitch.org)> wrote:

[kristian.kielhofner at...]

2009/4/3 Michael Collins <msc@freeswitch.org>: