However, that very same Phone Apps module seems to be what provides DPMA Apps to the Sangoma P phones. Fixes to the Sangoma P-Phone apps require that “Phone Apps” module to be upgraded, and the Phone Apps changelog references DPMA.
So, that makes me believe that the same module handles both REST (for non Sangoma-P) and DPMA (for Sangoma-P). And, if that is the case, then the message on that website above stating that the Phone Apps module does not support Sangoma-P … is not accurate.
You are correct, I’ve fixed the note and added a link. The Phone Apps module is indeed used to support the apps on the P-series phones, in addition to other modules.