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. _________________________________________________________________ Share your photos with Windows Live Photos – Free. http://clk.atdmt.com/UKM/go/134665338/direct/01/
2009/4/1 Stromin Normin <stormin.normin@hotmail.co.uk>
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.
Out of curiosity, what kind of phones are you using? -MC
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>
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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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 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 Now _________________________________________________________________ View your Twitter and Flickr updates from one place – Learn more! http://clk.atdmt.com/UKM/go/137984870/direct/01/
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>:
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
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 Now ________________________________ Surfing the web just got more rewarding. Download the New Internet Explorer 8 _______________________________________________ Freeswitch-users mailing list Freeswitch-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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:
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>:
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
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 Now ________________________________ Surfing the web just got more rewarding. Download the New Internet Explorer 8 _______________________________________________ Freeswitch-users mailing list Freeswitch-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
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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
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:
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
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>wrote:
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:
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
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On Thu, 02 Apr 2009 11:34:30 Thorhallur Sverrisson wrote:
The Polycom 650 is an IP phone, so the ground loop should not apply. Ground loops occur only in analog systems.
There is always an analog part to the system thus the potential for ground loops. It's common with snom phones when using a headset but I've not seen an issue with Polycom yet. hads -- http://nicegear.co.nz VoIP, DVB and other Linux compatible hardware.
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 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 Now _________________________________________________________________ View your Twitter and Flickr updates from one place – Learn more! http://clk.atdmt.com/UKM/go/137984870/direct/01/
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 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 Now _________________________________________________________________ Share your photos with Windows Live Photos – Free. http://clk.atdmt.com/UKM/go/134665338/direct/01/
Did it sound more like a machine gun? /b On Apr 3, 2009, at 9:02 AM, Stromin Normin wrote:
Thanks for all your help, I finally resolved the issue by setting comfort-noise to false in the conference.conf.xml.
Brian West brian@freeswitch.org -- Meet us a ClueCon! http://www.cluecon.com
2009/4/3 Michael Collins <msc@freeswitch.org>:
On Fri, Apr 3, 2009 at 7:11 AM, Brian West <brian@freeswitch.org> wrote:
Did it sound more like a machine gun? /b
Comfort noise for General Douglas McArthur I guess...
I thought General Norman Scwarzkopf (Stormin' Norman) would have been more appropriate: http://en.wikipedia.org/wiki/Norman_Schwarzkopf,_Jr. Sorry, I just couldn't resist. -- Kristian Kielhofner http://blog.krisk.org http://www.submityoursip.com http://www.astlinux.org http://www.star2star.com
participants (10)
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Anthony Minessale
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Brian West
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Chris Burns
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Giovanni Maruzzelli
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Hadley Rich
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Kristian Kielhofner
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Michael Collins
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Shelby Ramsey
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Stromin Normin
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Thorhallur Sverrisson