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<div class=Section1>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>The suggested “fix” from Cisco
has never worked for me.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>What has worked, however, is disassembling
the 2 pieces of the phone shell (front & back, should be 4 screws)<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>On the front half, where all of the
electronics are attached, find the hookswitch and remove it. Underneath,
there is a small white contact pad. Lift the contact pad and clean the
contacts underneath, which are probably turning a gold-ish color, with an
eraser until they are as silver as possible.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Reassemble everything and you should be
good to go.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>Hope that helps<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>-Dave<o:p></o:p></span></font></p>
<div>
<div class=MsoNormal align=center style='text-align:center'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> cisco-voip-bounces@puck.nether.net
[mailto:cisco-voip-bounces@puck.nether.net] <b><span style='font-weight:bold'>On
Behalf Of </span></b>Lelio Fulgenzi<br>
<b><span style='font-weight:bold'>Sent:</span></b> Wednesday, August 31, 2005
4:28 PM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">cisco-voip@puck.nether.net</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [cisco-voip]
Hookswitch problems on IP phones</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><a href="http://www.cisco.com/warp/public/788/AVVID/hook_switch.html">http://www.cisco.com/warp/public/788/AVVID/hook_switch.html</a><o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>in short,<o:p></o:p></span></font></p>
</div>
<div>
<h2><a name=intro><b><font size=5 face="Times New Roman"><span
style='font-size:18.0pt'>Introduction</span></font></b></a> <o:p></o:p></h2>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>A
thorough analysis of a large number of Cisco IP Phones that have been reported
as hardware failures has been completed and our research reveals that the great
majority of these phones do not have any determinable failure. The standard by
which the phone industry measures phone failures is based on Bell
Corp/Telcordia standards and the standard acceptable failure rate is set at 4
percent. The Cisco IP Phone's overall failure rate is well under the acceptable
industry average. Many of the problems that have been reported as hardware
failures are really either operational or cleanup issues. This document
describes some common troubleshoot steps to be taken before you attempt to
replace the Cisco IP Phone.<o:p></o:p></span></font></p>
<h3><a name=contacts><b><font size=4 face="Times New Roman"><span
style='font-size:13.5pt'>Self Cleaning Hookswitch Contacts</span></font></b></a>
<o:p></o:p></h3>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>The
hookswitch contacts design uses a wipe action to self-clean the contacts.
Periods of nonuse of the phone allow air impurities such as dust and other
contaminants to hinder contact performance, which results in intermittent
operation. Press and release the hookswitch rapidly a dozen times or so to
clean the contacts.<o:p></o:p></span></font></p>
<p><font size=3 face="Times New Roman"><span style='font-size:12.0pt'>If none
of the solutions above remedy the situation, Return Material Authorization
(RMA) the phone.<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>--------------------------------------------------------------------------------<br>
Lelio Fulgenzi, B.A.<br>
Network Analyst (CCS) * <st1:PlaceType w:st="on">University</st1:PlaceType> of <st1:PlaceName
w:st="on">Guelph</st1:PlaceName> * <st1:place w:st="on"><st1:City w:st="on">Guelph</st1:City>,
<st1:State w:st="on">Ontario</st1:State> <st1:PostalCode w:st="on">N1G 2W1</st1:PostalCode></st1:place><br>
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)<br>
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ <br>
"I had a coffee and Coke at lunch today...and now, I've got more jitter
than an<br>
IP phone on a long haul 10base2
connection"
LFJ<o:p></o:p></span></font></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<div>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='background:#E4E4E4'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:mfa@crec.ifas.ufl.edu" title="mfa@crec.ifas.ufl.edu">Mike
Armstrong</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>To:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:cisco-voip@puck.nether.net" title="cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a>
<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Sent:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> Wednesday, August
31, 2005 4:25 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial;font-weight:bold'>Subject:</span></font></b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'> [cisco-voip]
Hookswitch problems on IP phones<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>We're starting to see problems with the hookswitches on 7910 and 7940 <br>
phones. First occurrence was a couple of weeks ago, now 2 more in the
last <br>
week. Is this a trend, I wonder? (Phones are about 5 years
old.) Symptoms <br>
are that when the phone is lifted off-hook, the switch only goes off-hook <br>
for a brief instant, then goes back on-hook. The caller only hears a
brief <br>
click followed by a dead line, and the callee gets a bum rap for hanging up <br>
on his callers. One of my guys suspects the spring in there is weakening.
<br>
Is anyone else seeing similar problems?<br>
<br>
Mike Armstrong<br>
UF/IFAS CREC<br>
<st1:place w:st="on"><st1:City w:st="on">Lake Alfred</st1:City>, <st1:State
w:st="on">FL</st1:State></st1:place> <br>
<br>
_______________________________________________<br>
cisco-voip mailing list<br>
<a href="mailto:cisco-voip@puck.nether.net">cisco-voip@puck.nether.net</a><br>
<a href="https://puck.nether.net/mailman/listinfo/cisco-voip">https://puck.nether.net/mailman/listinfo/cisco-voip</a><o:p></o:p></span></font></p>
</blockquote>
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