i've logged a call with cisco over the exact same issue, this has now been classified as a bug and they are awaiting a beta firmware to come out. i must express dissatisfaction over it taking 6+ weeks for them to even acknowledge it as a bug.
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...