Have been using Digium Phone Module forever to configure digium phone and have recently switched to using EPM with DPMA to configure my digium phones.
Overall I see the value in this but there are some things that are causing headaches. Specifically how do I set alerts to trigger distinctive ring tones on phones through EPM? Is this only possible by editing the basefile for the phones?
Contact Sangoma, but for the most part, when you buy Sangoma or Digium phones, you get commercial EPM for free. Everyone else has to pay for EPM, and if you have any other phones that you want to use EPM with, you may need to license it for those phones.