Configuration examples

Quectel EC25-E

UAC (sound card) mode

[quectel0]
data=/dev/ttyUSB2
uac=on

TTY (serial port) mode

[quectel1]
data=/dev/ttyUSB2
audio=/dev/ttyUSB1

Quectel EP06

[quectel2]
data=/dev/ttyUSB2
audio=/dev/ttyUSB1
dsci=on

SimCOM SIM7600G-H

This module works on TTY mode only

[simcom0]
data=/dev/ttyUSB2
audio=/dev/ttyUSB4
slin16=on

SimCOM SIM900

[simcom1]
data=/dev/ttyUSB0
uac=ext
alsadev=hw:0

More details here.