RM502 sends always zeroes to o PCM stream

IoT Modules 5G Module
1

Hi,

Having RM502QGLAAR11A02M4G_01.200.01.200. After answering the call with ATA second USB port (USB PCM audio port) sending only zeroes. The actual RX PCM voice data expected. How to fix ?

P.S. I’m using CS voice, i.e.

AT+QNWPREFCFG=“voice_domain”,0

P.P.S Reproduce steps: start in Linux hex monitoring of voice port with tio - “tio -h /dev/voice_port”, call number, answer with ATA. Observe running zeroes in terminal instead live PCM data. Actual call is working as I can send DTMF’s with AT+VTS and can hear them from other side of call

2

BTW: Generating local DTMF’s with AT+QLDTMF do not produce anything at USB PCM voice port. I think this is bug

3

@Harbour where did you get that firmware? i’ve currently RM502QGLAAR11A02M4G_01.001.01.001 on my module but calls are refused and cannot be made using ATD command…

If you have the firmware, can you share it?
Thanks!