How to restore voice/call functionality on EG25-G?

IoT Modules LTE Standard Module
1

After making a few successful calls without audio I tried to switch audio mode of the modem to UAC. The virtual usb sound card is now visible, but now I cant make any calls and incoming calls are ended as busy.

ATD;
ERROR

I used these PDFs:

AT+QCFG=“USBCFG”
+QCFG: “usbcfg”,0x2C7C,0x125,1,1,1,1,1,0,1

AT+QPCMV?
+QPCMV: 1,2

then i thought maybe the voice calls were disabled and did some config based on quectel_ec2xeg9xeg2x-g_series_software_configuration_for_att_data-only_guide_v1-0.pdf

AT+QNVR=5280,0
+QNVR: “0000000000000000”

AT+QNVFR=“/nv/item_files/ims/IMS_enable”
+QNVFR: 01

AT+QNVFR=“/nv/item_files/modem/mmode/ue_usage_setting”
+QNVFR: 00

firmware:

ATI+QGMR

Quectel
EG25
Revision: EG25GGCR07A02M1G
EG25GGCR07A02M1G_30.001.30.001

I tried two different sim cards, ATD always ends with ERROR. Maybe I accidentally disabled call functionality? (SMS and internet is working)

Any help is appreciated.

2

I managed to make a call again by switching to 2g. Audio is working via UAC.

But I still can’t call in 4g mode’

Is there a command to reset the modem to default settings?

3

After updating the firmware to EG25GGCR07A02M1G_30.203.30.203 calls via LTE are working again.

So.. Calls, audio via UAC, sms and internet are now working under linux with modemmanager, plasma-dialer, spacebar and networkmanager.

The only thing that does not work is GNSS, but I assume it is because of no antenna on the module. It is GPD Pocket 4 4G LTE module and there are only two antenna pads :confused:

4

Topic closed. Solution was found by the original requester.