For my FreePBX setup, I do have the Digium add-ons installed, and I did have the Digium Module. However, I had to disable that module since it conflicted with EPM. In my situation (due to a variety of phone brands), it was easier to standardize on EPM, especially since the full license was purchased. Also, EPM is easier to use, even for Digium phones.
For my PBXAct setup, there is no Digium add-ons available for install, so my only choice is EPM. I was hoping that EPM would work better since Sangoma’s acquisition of Digium.