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List: cisco-voip
Subject: Re: [cisco-voip] Distant tunnel like sound
From: Brian Feeny <bfeeny () mac ! com>
Date: 2005-07-28 12:49:35
Message-ID: 8146715.1122554975946.JavaMail.bfeeny () mac ! com
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You should be looking at the levels, and adjusting the gain, attenuation and coverage \
to get an Echo Return Loss of at least 6db. Once you have that, you should be good \
to go. The telephony troubleshooting book by ciscopress has an excellent section on \
doing this.
Brian
On Thursday, July 28, 2005, at 08:34AM, Nick Kassel \
<Nick.Kassel@Charles-Stanley.co.uk> wrote:
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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I am trying to troubleshoot an issue at one of our remote
sites, they are suggesting that calls across the PSTN are sounding as if the
other end is distant and sounds like they are far away and down a tunnel.
Initially they had a echo issue which seems to have been resolved by adding a
echo cancel coverage command. The voice port is currently configured \
as</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>voice-port 1/0:15</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> input gain 6</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> output attenuation -6</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> echo-cancel coverage 32</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> cptone GB</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Can anyone suggest any further configuration that may \
help?</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Regards</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Nick </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal style='text-align:justify'><font size=3 face=Tahoma><span
style='font-size:12.0pt'> </span></font></p>
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