EC25-G VOLTE support Mexico

IoT Modules LTE Standard Module
1

I’m trying to get voice calls using VOLTE with Telcel Mexico (I have tried ATT too) in Mexico. I think the problem is that my module does not have the right MBN file to work with operators in Mexico.
I tried using:

"ROW_Generic_3GPP" and
"VoLTE-ATT"

The ATT one was tested with a ATT SIM card from Mexico.
Log history:

AT$QCPDPIMSCFGE?
$QCPDPIMSCFGE: 1 , 0 , 0 , 0
$QCPDPIMSCFGE: 2 , 1 , 0 , 0
$QCPDPIMSCFGE: 3 , 1 , 0 , 0


OK

AT+QMBNCFG="LIST"
+QMBNCFG: "List",0,0,0,"ROW_Generic_3GPP",0x0501081F,202112292
+QMBNCFG: "List",1,1,0,"VoLTE-ATT",0x0501033C,202203251
+QMBNCFG: "List",2,0,0,"hVoLTE-Verizon",0x05010141,202111151
+QMBNCFG: "List",3,0,0,"Sprint-VoLTE",0x05010205,202010201
+QMBNCFG: "List",4,0,0,"Commercial-TMO_VoLTE",0x05010505,202202211
+QMBNCFG: "List",5,0,0,"Telus-Commercial_DO",0x0580F601,202105061
+QMBNCFG: "List",6,0,0,"Commercial-SBM",0x05011C18,202004211
+QMBNCFG: "List",7,0,0,"Commercial-DT",0x05011F1C,202201041
+QMBNCFG: "List",8,0,0,"Reliance_OpnMkt",0x05011B38,202003251
+QMBNCFG: "List",9,0,0,"TF_Germany_VoLTE",0x05010C1B,202004151
+QMBNCFG: "List",10,0,0,"TF_Spain_VoLTE",0x05010CFA,202203241
+QMBNCFG: "List",11,0,0,"Volte_OpenMkt-Commercial-CMCC",0x05012071,202201063
+QMBNCFG: "List",12,0,0,"VoLTE_OPNMKT_CT",0x050113FC,202201101
+QMBNCFG: "List",13,0,0,"CU-VoLTE",0x05011508,202201063
+QMBNCFG: "List",14,0,0,"Telstra-Commercial_VoLTE",0x0580079E,202204021
+QMBNCFG: "List",15,0,0,"Commercial-KDDI",0x0501071D,202203011
+QMBNCFG: "List",16,0,0,"Commercial-DCM",0x05010D17,202203141
+QMBNCFG: "List",17,0,0,"Commercial-SKT",0x05012715,202202151
+QMBNCFG: "List",18,0,0,"Commercial-KT",0x05012C0D,202108241
+QMBNCFG: "List",19,0,0,"Commercial-LGU",0x05012626,202108241
+QMBNCFG: "List",20,0,0,"Commercial-USCC",0x0504FC40,202203021
+QMBNCFG: "List",21,0,0,"Optus-Commercial_VoLTE",0x05800CA2,201910241
+QMBNCFG: "List",22,0,0,"STC_Saudi_VoLTE",0x0501FE01,201912231
+QMBNCFG: "List",23,0,0,"Commercial-Rogers",0x05018821,202202091

OK

AT+QNWINFO
+QNWINFO: "FDD LTE","33450","LTE BAND 7",3150

OK

AT+CGDCONT?
+CGDCONT: 1,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 2,"IPV4V6","ims","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","SOS","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1

OK

AT+CGACT?
+CGACT: 1,1
+CGACT: 2,0
+CGACT: 3,0

OK

AT+CGPADDR
+CGPADDR: 1,"102.102.14.186"
+CGPADDR: 2,"0.0.0.0,0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0"
+CGPADDR: 3,"0.0.0.0,0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0"

OK

AT+COPS?
+COPS: 0,0,"AT&T 4G",7

OK

AT+QNVRF="/nv/item_files/modem/mmode/voice_domain_pref"
ERROR

AT+QNVFR="/nv/item_files/modem/mmode/sms_domain_pref"
ERROR

ATI
Quectel
EG25
Revision: EG25GGBR07A08M2G

OK

AT+CIMI
334050253439475

OK

AT+QCCID
+QCCID: 8952050102013253577F

OK

AT+QCFG="nwscanseq"
+QCFG: "nwscanseq",0403010502

OK

AT+QCFG="nwscanmode"
+QCFG: "nwscanmode",3

OK

AT+CGREG?
+CGREG: 0,1

OK
AT+CEREG?
+CEREG: 0,1

OK

AT+CREG?
+CREG: 0,1

OK

ATD+5281XXXXX41;
ERROR

I can send SMSs.

Can I get help on this?

2

I missed to add the result of this command:

AT+QENG="SERVINGCELL"
+QENG: "servingcell","NOCONN","LTE","FDD",334,020,3060401,357,2050,4,5,5,F1D,-95,-11,-64,12,26

OK

The NOCONN is a problem there.

3

Hi Eduar Tua,

It’s seems the MBN file don not activite from the message you provide, pls execute AT+QMBNCFG=“Autosel” to query the auto activate MBN file function is enable or not. Then you can set the AT+QMBNCFG=“Autosel”,1 enable MBN file auto activate.
Maybe you can execute AT+QCFG=“nwscanmode”,0 firstly, then try the above process, thanks.

4

@Eduar_Tua I am running into similar issues with Telcel and EG-25G. Have you managed to get it working? Is there a Telcel specific MBN that worked for you?

Thanks in advance!

5

Hey, I was not able to get it working. VoLTE is enabled but once the call is accepted it falls back to 3G. How about you? What MBN file are you using?