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88XX offhook/onhook issues

Has anybody encountered an issue where your 88XX (specifically 8851) phones have randomly exhibited off-hook/on-hook tendencies?  Over the past year we have had upwards of 250+ phones randomly go off-hook then on-hook in less than a second, sometimes causing active calls to be dropped.  Different hardware and firmware versions but the symptoms are always the same.  TAC hasn't found anything yet, so I'm just trying to gauge if this is an issue others are having.  Thanks.

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VIP Collaborator

Re: 88XX offhook/onhook issues

Hi there


Not with 88XX. Below are the same behavior with 7900 phones


7942 / 7962 phones go off-hook and then on-hook 400 milliseconds later
Bug ID  - CSCto78441
7962 phones are going off hook and then on hook 400 milliseconds later, which prevents the user from answering the call properly. This behavior can be seen in the SDI traces:

11:33:42.540 |StationInit: (0000030) OffHook.|1,100,49,1.584290

and then back on hook roughly 400 milliseconds later:

11:33:42.981 |StationInit: (0000030) OnHook.|1,100,49,1.584297

This can occur on 7942 or 7962, and is more likely to occur when the phone is sitting at a steep angle and especially with a sidecar attached.

1. Invert the wall mount tab to be in wall mount mode.

2. Reduce the angle at which the phone is sitting by two notches. This may not be possible if a sidecar is mounted.

3. Do not use a handset, use only a headset.

4. Open a case with Cisco Customer Service or Cisco Technical support to have the affected handsets replaced.

Hope this Helps

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Re: 88XX offhook/onhook issues

Has there been any update to this issue? We are having the same issue with a couple of phones on our network, one actually on the network and the second one registered back thru the expressway. 


Re: 88XX offhook/onhook issues

We had Cisco AS out to one of our sites to observe the issue.  They saw it first hand and recorded the issue to confirm it is happening.  They sent the offending phones in for hardware analysis.  Their conclusion was that there was corrosion on the hook switch.  Whether or not that was the cause of the issue for the dozens of phones we had/have with this problem I cannot say, but the one that they analyzed had corrosion on it.

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VIP Advisor

Re: 88XX offhook/onhook issues

I can't help but click the Chuck Taylor logo.

Anthony Holloway

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