EG912Y SMS tx problem when voLTE is enabled on SIM-card

IoT Modules LTE Standard Module
1

Hi,

I have a problem with the module EG912Y version EG912YEUAAR01A08M16 when I try to send SMS messages from the modulo EG912Y (with simcard TIM volte) to a phone (with simcard TIM volte) only when the volte is enabled in both the simcard.
The problem is that the command "AT+CMGS= … " return ERROR.

If volte is disabled all work.

What can I check?

Thank you,

Stefano

2

Hi
Please refer to the following process to send SMS, thank you
image

3

Hi @FelixCheng-Q , Same problem here with an EC25-EUX with FW EC25EUXGAR08A10M1G_20.003.20.003 and SIM from italian TIM operator.

IN 4G MODE
+QIND: PB DONE
AT
AT
OK
ATE0
ATE0
OK
AT+CREG=2
OK
AT+CEREG=2
OK
AT+CGREG=2
OK
AT+COPS=2
OK
+CREG: 0
+CGREG: 0
+CEREG: 0
+CREG: 0
+CGREG: 0
+CEREG: 0
AT+QICSGP=1,1,“ibox.tim.it”,“”,“”,0
OK
AT+COPS=0,0,“I TIM”,7
OK
+CEREG: 2
+CREG: 1,“5018”,“F5BBB17”,7
+CGREG: 1,“5018”,“F5BBB17”,7
+CEREG: 1,“5018”,“F5BBB17”,7
+CREG: 1,“5018”,“C42FD20”,7
+CGREG: 1,“5018”,“C42FD20”,7
+CEREG: 1,“5018”,“C42FD20”,7
AT+CMGF=1
OK
AT+CSCS=“GSM”
OK
AT+CMGS=“346xxxxx8”
.>
test•
+CMS ERROR: 500
AT+CMGS=“346xxxxx8”
.>
test2•
+CMS ERROR: 500

IN 2G MODE
+QIND: PB DONE
AT
AT
OK
ATE0
ATE0
OK
AT+CREG=2
OK
AT+CEREG=2
OK
AT+CGREG=2
OK
AT+COPS=2
OK
+CREG: 0
+CGREG: 0
+CEREG: 0
+CREG: 0
+CGREG: 0
+CEREG: 0
AT+QICSGP=1,1,“ibox.tim.it”,“”,“”,0
OK
AT+COPS=0,0,“I TIM”,0
OK
+CREG: 1,“62D6”,“8E8A”,0
+CGREG: 2
+CEREG: 2
+CGREG: 1,“62D6”,“8E8A”,3
+CEREG: 4
AT+CMGF=1
OK
AT+CSCS=“GSM”
OK
AT+CMGS=“346xxxxx8”
.>
test3•
+CMGS: 39
OK
AT+CMGS=“346xxxxx8”
.>
test4•
+CMGS: 40
OK

4

4G is a packet-domain-only service. Is the modem set to circuit-switched-only?

What does AT+CGSMS? return?

I suggest AT+CGSMS=2 as the best setting.

5

Thank you for reply.
AT+CGSMS=2 doesn’t work, like =0, =1 and =3.

The only way wich we can send sms with TIM network is settings SMS domain in SGs with the command
AT+QNVFW=“/nv/item_files/modem/mmode/sms_domain_pref”,00
and then RESET the module.

Unfortunately this means that if we wanna change the SIM operator to an other wich can send SMS through IMS we must send again the command
AT+QNVFW=“/nv/item_files/modem/mmode/sms_domain_pref”,01
and then RESET the module.

Other module makers do it automatically… there is such a way to do it automatically with the EC25-EUX too???