Cisco IP Phones Installation And Configuration Manual page 9

Netvanta unified communications technical note
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3. The Cisco phone does not respond to restart/reload configuration requests from the UC
client, or incorrect identity/identities assigned to the phone.
If you experience the symptoms above, you can reset the protocol settings:
Open a Telnet session to the phone.
Enter the password cisco.
Issue the command erase protflash.
A manual reboot may be required if the phone does not reboot after 10 minutes.
If this does not address the issue, you can perform a factory default reset:
Hold down the # key as soon as the phone starts to power up.
When prompted to enter the factory default key sequence, dial 123456789*0#.
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