Quectel EM12-G Audio is distorted over calls
When trying to make a call using a Quectel EM12-G modem the audio is distorted. I don't have distorted audio when using a BM818 modem, so I'm thinking it's a configuration issue with the modem. Even any ideas of where to start debugging would be really helpful
Modem details are below
sudo mmcli -m any
-----------------------------------
General | path: /org/freedesktop/ModemManager1/Modem/1
| device id: ####
-----------------------------------
Hardware | manufacturer: Quectel
| model: EM12-G
| firmware revision: EM12GPAR01A21M4G
| carrier config: Commercial-TMO
| carrier config revision: 08010511
| h/w revision: EM12-G
| supported: gsm-umts, lte
| current: gsm-umts, lte
| equipment id: ####
-----------------------------------
System | device: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-4
| physdev: /sys/devices/pci0000:00/0000:00:14.0/usb1/1-4
| drivers: cdc_mbim, option
| plugin: quectel
| primary port: cdc-wdm0
| ports: cdc-wdm0 (mbim), ttyUSB0 (ignored), ttyUSB1 (gps),
| wwp0s20f0u4i8 (net)
-----------------------------------
Numbers | own: ####
-----------------------------------
Status | lock: sim-pin2
| unlock retries: sim-pin2 (10)
| state: enabled
| power state: on
| signal quality: 0% (recent)
-----------------------------------
Modes | supported: allowed: 3g; preferred: none
| allowed: 4g; preferred: none
| allowed: 3g, 4g; preferred: 4g
| allowed: 3g, 4g; preferred: 3g
| current: allowed: 3g, 4g; preferred: 4g
-----------------------------------
Bands | supported: utran-1, utran-3, utran-4, utran-6, utran-5, utran-8,
| utran-9, utran-2, eutran-1, eutran-2, eutran-3, eutran-4, eutran-5,
| eutran-7, eutran-8, eutran-9, eutran-12, eutran-13, eutran-14,
| eutran-17, eutran-18, eutran-19, eutran-20, eutran-21, eutran-25,
| eutran-26, eutran-28, eutran-29, eutran-30, eutran-32, eutran-38,
| eutran-39, eutran-40, eutran-41, eutran-66, utran-19
| current: utran-1, utran-3, utran-4, utran-5, utran-8, utran-9,
| utran-2, eutran-1, eutran-2, eutran-3, eutran-4, eutran-5, eutran-7,
| eutran-8, eutran-9, eutran-12, eutran-13, eutran-14, eutran-18,
| eutran-19, eutran-20, eutran-21, eutran-25, eutran-26, eutran-28,
| eutran-29, eutran-30, eutran-32, eutran-38, eutran-39, eutran-40,
| eutran-41, eutran-66, utran-19
-----------------------------------
IP | supported: ipv4, ipv6, ipv4v6
-----------------------------------
3GPP | imei: ####
| enabled locks: fixed-dialing
| registration: idle
-----------------------------------
3GPP EPS | initial bearer apn: fast.t-mobile.com
-----------------------------------
SIM | primary sim path: /org/freedesktop/ModemManager1/SIM/1
| sim slot paths: slot 1: /org/freedesktop/ModemManager1/SIM/1 (active)
| slot 2: none