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asterisk at coltect.no...
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 Posted: Mon Apr 07, 2008 7:17 am Post subject: [asterisk-users] screeching noise on zap channels |
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I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports, and
2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec echo
canceller.
In my testing, I have only experienced it on hang up of a call, but some of
the users say they have heard it at other times. It sounds like feedback
building up. The Receptionist said she had taken about 40 calls this
morning, and had only heard it once.
Because of the nature of the noise I have heard, I suspect something with
the echo cancelling, but I have no idea where to start looking. Maybe it
would just be easier/quicker to try a different echo canceller.
There is no noticable echo during conversations.
No one has heard the noise between the 2 sip phones, but as it seems
intermittent, this may be irrelevant.
Any hints as to how to track this noise down ?
Thanks,
Col |
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stotaro at totarotechn...
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| Posted: Mon Apr 07, 2008 7:28 am Post subject: [asterisk-users] screeching noise on zap channels |
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On Mon, Apr 7, 2008 at 8:17 AM, Col Ferguson <asterisk at coltect.no-ip.com> wrote:
| Quote: | I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports, and
2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec echo
canceller.
In my testing, I have only experienced it on hang up of a call, but some of
the users say they have heard it at other times. It sounds like feedback
building up. The Receptionist said she had taken about 40 calls this
morning, and had only heard it once.
Because of the nature of the noise I have heard, I suspect something with
the echo cancelling, but I have no idea where to start looking. Maybe it
would just be easier/quicker to try a different echo canceller.
There is no noticable echo during conversations.
No one has heard the noise between the 2 sip phones, but as it seems
intermittent, this may be irrelevant.
Any hints as to how to track this noise down ?
Thanks,
Col
|
Start by turning off echo can on your zap channels. I have setup many
analog FXI systems that never needed echo can.
Thanks,
Steve Totaro |
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tzafrir.cohen at xorco...
Guest
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| Posted: Mon Apr 07, 2008 7:36 am Post subject: [asterisk-users] screeching noise on zap channels |
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On Mon, Apr 07, 2008 at 10:17:33PM +1000, Col Ferguson wrote:
| Quote: | I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports, and
2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec echo
canceller.
|
Fixed in zaptel 1.2/1.4 SVN (or in the
http://updates.xorcom.com/astribank/src/zaptel-1.4.9.2.xpp.r5566.tar.gz
)
--
Tzafrir Cohen
icq#16849755 jabber:tzafrir.cohen at xorcom.com
+972-50-7952406 mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com iax:guest at local.xorcom.com/tzafrir |
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asterisk at coltect.no...
Guest
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| Posted: Mon Apr 07, 2008 7:42 am Post subject: [asterisk-users] screeching noise on zap channels |
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----- Original Message -----
From: "Steve Totaro" <stotaro at totarotechnologies.com>
To: "Asterisk Users Mailing List - Non-Commercial Discussion"
<asterisk-users at lists.digium.com>
Sent: Monday, April 07, 2008 10:28 PM
Subject: Re: [asterisk-users] screeching noise on zap channels
| Quote: | On Mon, Apr 7, 2008 at 8:17 AM, Col Ferguson <asterisk at coltect.no-ip.com>
|
wrote:
| Quote: | | Quote: | I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports,
|
|
and
| Quote: | | Quote: | 2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec
|
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echo
| Quote: | | Quote: | canceller.
In my testing, I have only experienced it on hang up of a call, but
|
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some of
| Quote: | | Quote: | the users say they have heard it at other times. It sounds like
|
|
feedback
| Quote: | | Quote: | building up. The Receptionist said she had taken about 40 calls this
morning, and had only heard it once.
Because of the nature of the noise I have heard, I suspect something
|
|
with
| Quote: | | Quote: | the echo cancelling, but I have no idea where to start looking. Maybe
|
|
it
| Quote: | | Quote: | would just be easier/quicker to try a different echo canceller.
There is no noticable echo during conversations.
No one has heard the noise between the 2 sip phones, but as it seems
intermittent, this may be irrelevant.
Any hints as to how to track this noise down ?
Thanks,
Col
|
Start by turning off echo can on your zap channels. I have setup many
analog FXI systems that never needed echo can.
Thanks,
Steve Totaro
|
Thanks Steve,
I suppose that would be a good place to start testing.
Col
11:12 AM
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stotaro at totarotechn...
Guest
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| Posted: Mon Apr 07, 2008 7:44 am Post subject: [asterisk-users] screeching noise on zap channels |
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On Mon, Apr 7, 2008 at 8:36 AM, Tzafrir Cohen <tzafrir.cohen at xorcom.com> wrote:
| Quote: | On Mon, Apr 07, 2008 at 10:17:33PM +1000, Col Ferguson wrote:
| Quote: | I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports, and
2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec echo
canceller.
|
Fixed in zaptel 1.2/1.4 SVN (or in the
http://updates.xorcom.com/astribank/src/zaptel-1.4.9.2.xpp.r5566.tar.gz
)
--
Tzafrir Cohen
icq#16849755 jabber:tzafrir.cohen at xorcom.com
+972-50-7952406 mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com iax:guest at local.xorcom.com/tzafrir
|
Was it a function of echo cancellation?
Thanks,
Steve Totaro |
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asterisk at coltect.no...
Guest
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| Posted: Mon Apr 07, 2008 7:47 am Post subject: [asterisk-users] screeching noise on zap channels |
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Thanks Tzafrir,
I will try that.
Cheers,
Col
----- Original Message -----
From: "Tzafrir Cohen" <tzafrir.cohen at xorcom.com>
To: <asterisk-users at lists.digium.com>
Sent: Monday, April 07, 2008 10:36 PM
Subject: Re: [asterisk-users] screeching noise on zap channels
| Quote: | On Mon, Apr 07, 2008 at 10:17:33PM +1000, Col Ferguson wrote:
| Quote: | I have been working on a system where sometimes the users get a horrible
screeching noise that gets louder, typically as a call is hung up.
The system has 2 analog astribank channels with 8 FXO and 56 FXS ports,
|
|
and
| Quote: | | Quote: | 2 SIP phones, Asterisk 1.4.18, Zaptel 1.4.9.2. It is using the oslec
|
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echo
11:12 AM
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tzafrir.cohen at xorco...
Guest
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| Posted: Mon Apr 07, 2008 8:08 am Post subject: [asterisk-users] screeching noise on zap channels |
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On Mon, Apr 07, 2008 at 08:44:50AM -0400, Steve Totaro wrote:
| Quote: | Was it a function of echo cancellation?
|
A case that was not handled well with echo cancellation in previous
versions.
http://svn.digium.com/view/zaptel?view=rev&revision=4013
--
Tzafrir Cohen
icq#16849755 jabber:tzafrir.cohen at xorcom.com
+972-50-7952406 mailto:tzafrir.cohen at xorcom.com
http://www.xorcom.com iax:guest at local.xorcom.com/tzafrir |
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