Problem with incoming calls (w/o ModemManager/Ofono)

[mouffa]

I doubt you are not using any modem software, you can read my thread on the hardware interface of the modem, the communication is complex, you get a signal at ring indicator pin and the voice data pass through the pcm interface to the sound module and then to ALSA

you definitely need the eg25-manager too for the power except if you do it totally manually with the gpio pins

I agree that regardless all these the calls should show up in the terminal but again maybe something interferes, it would be a good idea to try another OS for the same behaviour

I had uploaded an extensive AT manual but someone removed it