Hello,
These commands for voice domain configuration might be of help here:
gsmctl -A 'AT+QNWPREFCFG="voice_domain",0' - circuit switching voice only;
gsmctl -A 'AT+QNWPREFCFG="voice_domain",1' - IMS PS voice only;
gsmctl -A 'AT+QNWPREFCFG="voice_domain",2' - circuit switching voice preferred;
gsmctl -A 'AT+QNWPREFCFG="voice_domain",3' - IMS voice preferred;
They can be run via the CLI or SSH, as per the instructions described here.
Service domain can also be configured using these commands if needed:
gsmctl -A 'AT+QNWPREFCFG="srv_domain",0' - circuit switching only;
gsmctl -A 'AT+QNWPREFCFG="srv_domain",1' - packet switching only;
gsmctl -A 'AT+QNWPREFCFG="srv_domain",2' - CS & PS;
Let me know if any additional information is needed!
Best regards,
DaumantasG