MEGAphone Cellular Modem and Power Control Hook-up for R3 Boards and Phone Call Handling

For the current MEGAphone prototyping, I am using the MEGA65 R3 mainboards. The R3 specifically has on-board speaker drivers that I'm going to use for the ringer. Those drivers do have a bit of a heat-generating issue with some speakers because the audio is not filtered from digital before it hits them, but for ring indication purposes they should be just fine. Anyway, whichever main board…