I have an RC760-1 (R8 firmware) with an EE SIM. I have configured for LTE only (KSRAT=5). However, the module will no longer make VoLTE calls. Immediately after issue the ATD command, the module responds with ERROR. It used to work OK but has been failing for last few days. Any ideas why?
See below for the AT!GSTATUS? response prior to dialling (I have changed the dial number for obvious reasons):
AT+CSQ;+CESQ
+CSQ: 14,99
+CESQ: 99,99,255,255,16,27
OK
AT!GSTATUS?;DT12345678901;
!GSTATUS:
Current Time: 209…Temperature: 34
Modem Mitigate Level: 0…ModemProc Mitigate Level: 0.
Reset Counter: 1…Mode: ONLINE
System mode: LTE .PS state: Attached
IMS reg state: NOT REGISTERED .IMS mode: Normal
IMS Srv State: NO SMS,NO VoIP
LTE band: B3 …LTE bw: 10 MHz
LTE Rx chan: 1761…LTE Tx chan: 19617
LTE CA state: INACTIVE
EMM state: Registered .Normal Service
RRC state: RRC Idle
PCC RxM RSSI: -84…RSRP (dBm): -113
PCC RxD RSSI: -97…RSRP (dBm): -139
Tx Power: --…TAC: 2C8D (11405)
RSRQ (dB): -11…Cell ID: 0069EA03 (6941187)
SINR (dB): 4.6
ERROR
could it be sim card or network problem as you said that it was working before?
Perhaps, but I would have thought that a network problem would have been resolved by the operator after a few days. The SIM is the same one that I used several days ago when VoLTE calls were working OK.
maybe it worths to try other operator to isolate if this is network problem