The phone will show a 7 seconds count down. This is the only open window to press the key combination to go to the hard reset page.
VVX series (VVX300, 301, 310, 311, etc): Press and hold 1 3 5 within the 7-second count down until it prompts you to the password page
Sound Point IP 335: Press and hold 1 3 5 7 within the 7-second count down until it prompts you to the password page
Sound Point IP series (IP550,560,570, etc): Press and hold 4 6 8* within the 7-second count down until it prompts you to the password page
Conference Phone IP5000, 6000, 7000: Press and hold 1 3 5 7 within the 7-second count down until it prompts you to the password page