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After factory reset the phone didn't register

datacenter
Level 1
Level 1

‎04-14-2011 04:08 AM - edited ‎03-16-2019 04:30 AM

After we make a factory reset on IP phone 7941 it stopped to register on our Call Manager 7.1.3.

If I downgrade de firmware version, the Phone restarted every time at the boot (not registered) and with the new Firmware the Phone hangs in the cisco screen (still not registered).

Do you know what is going on? Plese help me!

Thank you,

Phamella

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barry
Level 7
Level 7

‎04-14-2011 08:54 AM

Hi

Yes, I've seen this one a few times. It seems that the bootloader inside the phone doesn't like newer (signed) CUCM firmware images.

The only way I've found to fix this is use an older (unsigned) firmware image initially, and then upgrade to the latest (signed)image afterwards.

To do this I:

1. Built a CME environmnet on a 2801 ISR and loaded 8.5 unsigned firmware images onto that

2. Registered the handset with the CME and upgraded it to 8.5

3. Reregistered the handset with CUCM and upgraded it to 9

Sorry, it's a bit painful but I did manage to recover them eventually.

Barry

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