Hi snowgun,
thanks for your your help, The responses look normal. In general VoLTE works without issues. But sometimes a few devices get in the described error state. A restart of the LTE module solves the issue.
at+qmbncfg=“List”
+QMBNCFG: “List”,0,1,1,“ROW_Generic_3GPP”,0x05010824,201712241
+QMBNCFG: “List”,1,0,0,“Reliance_OpnMkt”,0x05011B4B,201801051
+QMBNCFG: “List”,2,0,0,“TW_Mobile_China_VoLTE”,0x05800301,201801221
+QMBNCFG: “List”,3,0,0,“Telstra-Commercial_VoLTE”,0x05800710,201710161
+QMBNCFG: “List”,4,0,0,“Commercial-Smartfren”,0x05012509,201801081
+QMBNCFG: “List”,5,0,0,“Bouygues_France_VoLTE”,0x05800101,201705111
+QMBNCFG: “List”,6,0,0,“VF_Germany_VoLTE”,0x05010415,201705111
+QMBNCFG: “List”,7,0,0,“Swis_switzerland_VoLTE_VoWiFi”,0x05010421,201712231
AT$QCPDPIMSCFGE?
$QCPDPIMSCFGE: 1 , 0 , 0 , 0
$QCPDPIMSCFGE: 2 , 1 , 0 , 0
$QCPDPIMSCFGE: 3 , 1 , 0 , 0
$QCPDPIMSCFGE: 6 , 0 , 0 , 0
$QCPDPIMSCFGE: 7 , 0 , 0 , 0
$QCPDPIMSCFGE: 8 , 0 , 0 , 0
$QCPDPIMSCFGE: 9 , 0 , 0 , 0