Users cannot use the 7920 Wireless IP phone if it is locked and the password is lost.
To unlock the 7920 Wireless IP phone, perform this procedure:
For other options, refer to Advanced Cisco 7920 Commands.
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IP phones and other clients (Client registration, faulty IP phone, etc.)
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Wireless IP phone 7920
A bit late to the party, but since I couldn't find any info about my specific situation and I figured out how to solve it, I thought I'd post it here.
I had several 7920 phones with German locale that I wanted to perform a factory reset on. The solution I found on the interwebs 'Menu' > * # # > 'send' didn't provide me with the menu option "factory reset" under "Phone Settings".
To perform the factory reset perform these steps (if the phone has a different locale, navigate to the corresponding menu options in that language):
1. Turn the phone on2. <Menu>3. <Phone Settings>4. <Phone Lock>5. <On/Off>6. Set to "On"7. Turn phone off
8. Turn phone on9. You will be prompted for a password, the password to use is *7#9#2#0#* (as a security precaution the phone is restored to the factory default settings and English language)