Note: If you choose factory reset, you will return the phone to the original factory settings and will erase all current settings, including the directory and call logs.
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On the SPA itself, press “Setup” (https://www.cisco.com/c/dam/en/us/support/docs/collaboration-endpoints/spa901-1-line-ip-phone/108802-5220-001.png).
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Go to Factory Reset (14) using “Navigation” (https://www.cisco.com/c/dam/en/us/support/docs/collaboration-endpoints/spa901-1-line-ip-phone/108802-5220-003.png).
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Press the “OK” soft key. SPA will reboot and will be back to its default settings.