[cisco-voip] Hookswitch problems on IP phones

[Lelio Fulgenzi]

http://www.cisco.com/warp/public/788/AVVID/hook_switch.html

in short,
Introduction 
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.

Self Cleaning Hookswitch Contacts 
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.

If none of the solutions above remedy the situation, Return Material Authorization (RMA) the phone.


--------------------------------------------------------------------------------
Lelio Fulgenzi, B.A.
Network Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1
(519) 824-4120 x56354 (519) 767-1060 FAX (JNHN)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
"I had a coffee and Coke at lunch today...and now, I've got more jitter than an
IP phone on a long haul 10base2 connection"                                           LFJ
  ----- Original Message ----- 
  From: Mike Armstrong 
  To: cisco-voip at puck.nether.net 
  Sent: Wednesday, August 31, 2005 4:25 PM
  Subject: [cisco-voip] Hookswitch problems on IP phones


  We're starting to see problems with the hookswitches on 7910 and 7940 
  phones.  First occurrence was a couple of weeks ago, now 2 more in the last 
  week.  Is this a trend, I wonder?  (Phones are about 5 years old.)  Symptoms 
  are that when the phone is lifted off-hook, the switch only goes off-hook 
  for a brief instant, then goes back on-hook.  The caller only hears a brief 
  click followed by a dead line, and the callee gets a bum rap for hanging up 
  on his callers.  One of my guys suspects the spring in there is weakening. 
  Is anyone else seeing similar problems?

  Mike Armstrong
  UF/IFAS CREC
  Lake Alfred, FL 

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