I am running FreePBX 12/Asterisks 11 as well and I am not running into anything nasty either.
- UCP does not show outbound number it shows the Device ID CDR is correct but not UCP
- The endpoint manager does not send the account Name but the device ID.
- The endpoint manager has issues with multiple accounts per phone (not sure about this one still working on it.
I am just doing some investigating prior to upgrading.
-Mark