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New Member

7962 VOIP Phone Dies After switch upgrade/reboot



Recently I upgraded several access swicthes (2960, 3650's) which have POE and Cisco 7962 phones connected.  After the upgarde and subsequent reboot, the IP phones failed to power up and are effectively dead.


All that happen on the phone now is that when the POE cable is connected, the phones mute button LED light flashes before the spekaer LED lights up and remains lite up.


Approx 5 phones across multiple switches have died this way.


Can anyone tell me if this is a behaviour they have experience and how they may have recovered from it.

  • IP Telephony
Everyone's tags (1)
Hall of Fame Super Gold

Disconnect the phone from the

Disconnect the phone from the network and plug the phone directly into the switch port using a different ethernet cable.

New Member

Thanks for the reponse, this

Thanks for the reponse, this has been tried and tested unsucessfully.


Any other tips?

VIP Purple

Try connecting Power adaptor

Try connecting Power adaptor , if u have .

Is this happening only for 7962 phones?


u can also run show power inline .what is the version u have upgraded switch to ?



New Member

I am searching for a power

I am searching for a power adapter now.


Yes - appears to be only 7962

The Watts are displaying as 7.0 as opposed to the normal 6.3 and the Device ID is showing IEEE PD

Version 12.2(55SE9)


Hall of Fame Super Gold

If you've plugged the phone

If you've plugged the phone directly to the switch and using a different patch cable and it still doesn't work.  There's a strong chance your phone is dead.  

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