There are two ways to reset the Akuvox Phone.
To reset the IP phone via web user interface
Click on Upgrade > Basic
Click Reset to Factory Setting
To reset the IP phone directly
Hold the Home Key a few seconds until a prompt "Reset to factory?" shows up, click OK
Go to the path Menu->Settings->Advanced Setting->Enter password(default: admin)->Select Reset to factory, then click OK
Product type: SP-R50(P), SP-R52(P), SP-R53(P) and SP-R59(P)