The only two ways to factory reset that unit is through the IVR or the hard reset button. The IVR should work even if you lost access to the Web interface. I would suggest that you call Cisco support at 1-866-606-1866 if the unit is within 1 year of purchase or see if you can get the unit replaced from your reseller. There are no other hidden procedures that I know of that will reset the unit other than the two mentioned above.
Network Address Translation (NAT) Settings for Lines on PAP2T and SPA3102 Phone Adapters
The objective of this document is to configure Network Address Translation (NAT) settings for the lines of communication on the PAP2T ...
Speed Dial Settings on SPA100 Series
Speed Dial Buttons are often used to make the process of calling regularly used contacts quicker and with one button. This option is used in place of dialing the entire phone number in. ...
Firmware Upgrade on SPA112 and SPA122
To upgrade the firmware a specific file must be downloaded from the Internet and uploaded to the device. Upgrading your devices can be very useful. Firmware upgrades can fix software bu...