I will update the tarball to clarify the license terms. As far as it being based around the Digium phones module I meant the layout and ease of use not the actual code. I like how they displayed the phones in a table format and when editing a phone the options were in dropdowns. The OSS endpoint manager requires editing of XML files for advanced configuration.
The Polycom phone module determines which FreePBX modules are enabled, their feature codes, and builds the configuration around that. For example if you install the Parking module a Park softkey will appear on the phone and you will have the option to add parking slot BLF keys to the phone.