DGC Modem
These are generic modems sold under different names (Voluxe, MagiDeal, Baoblaze, Infosec, Kirmax), labeled in the most generic way
Well mine was named Kalea, opening the device it turns to be a connexant chipset File:CX-39010.pdf
Now I highly doubt these chips were made in 2021, the board itself is labeled 2017.
But these seems to be hardware modems nonetheless, and they do resport do AT commands:
Welcome to minicom 2.7.1 OPTIONS: I18n Compiled on Jul 22 2021, 00:00:00. Port /dev/ttyACM1, 01:10:34 Press CTRL-A Z for help on special keys at OK ati 56000 OK ati0 56000 OK ati1 OK ati2 OK ati3 CX93001-EIS_V0.2013-V92 OK ati4 OK ati5 B5 OK ati6 OK ati7 OK
DSPKOUT wasn't routed on the board so for speaker support:
