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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>We’re getting a small but increasing number of
complaints about echo where the talker hears him/herself. In pursuing this
doc:<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><a
href="http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml#IOSecho1">http://www.cisco.com/en/US/tech/tk652/tk698/technologies_tech_note09186a0080149a1f.shtml#IOSecho1</a><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>about echo, I’m wondering about 7911s. Virtually
all complaints have come from people with 7911s, and the doc states this:
“</span></font><span class=content>Currently, available load IDs only
include echo cancellation on the speaker phone.” So ASSUMING (which
I’m not as yet) the gateway is doing echo cancelling properly, are my
7911 users doomed with no firmware with echo cancellation? I’m
searching but can’t find an answer.<o:p></o:p></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>So far as doing some troubleshooting on our gateways,
it appears we don’t fall into any of the known bug categories with IOS
and DSPWare, so I want to do this as recommended by the doc:<o:p></o:p></span></font></span></p>
<h3><a name=DSP><b><font size=4 face="Times New Roman"><span style='font-size:
13.5pt'>Troubleshoot Echo Problems with these DSP Voice Quality Metrics</span></font></b></a>
<o:p></o:p></h3>
<p style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Check the delay (DSP/DL) and
R-factor (DSP/RF) statistics. You can potentially find perceptible delay
between when the originating signal is transmitted and when the echo returns.
In most telephones, sidetone helps mask some of the echo. Echos must be delayed
by at least 20 milliseconds in order to be perceived. <o:p></o:p></p>
<p style='margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><font
size=2 face=Symbol><span style='font-size:10.0pt;font-family:Symbol'><span
style='mso-list:Ignore'>·<font size=1 face="Times New Roman"><span
style='font:7.0pt "Times New Roman"'>
</span></font></span></span></font><![endif]>Check the level (DSP/LE)
statitstic for sufficient echo amplitude. If the amplitude of the echo is low,
it can go unnoticed. <o:p></o:p></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Unfortunately I don’t know how to do this. Is
it way involved or can someone get me started?<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>Thanks<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>jeff<o:p></o:p></span></font></span></p>
<p class=MsoNormal><span class=content><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></span></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
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