Important: The Snom PA-1 MUST be upgraded to firmware version 22.214.171.124. You can do that by going here: https://service.snom.com/display/wiki/FW+v126.96.36.199+MRU+PA1 and updating it manually.
Step 1: Log into the device
Step 2: Click the "Advanced" section on the left navigation area.
Step 3: Go to the "Update" tab.
Step 4: Set "Update Policy" to Automatic.
Step 5: Set the Setting URL to the address in the PBX Provisioning GUI for SNOM devices.
Step 6: Set "PnP Config" to Off.
Step 7: Click "Apply" below.
Step 8: Make sure to Save Changes before you Reboot.