EC21 VOLTE Support

Hi there I’m currently working on a project that uses your EC21-E mPCIe Modules, I’m having some trouble with getting VOLTE to work. I’ve got a sim that supports VOLTE and have a strong 4G connection but as soon as i make or receive a call the EC21 drops down to a 3G connection. I’ve looked all over the “Quectel_EC2x&EG9x&EG2x-G&EM05_Series_AT_Commands_Manual_V2.0” and cant fined anything to do with VOTE.

+QMBNCFG: “List”,0,0,0,“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

+QCFG: “ims”,0,0

I am in the UK

Please try configuring the module as voice centric mode, thank you.
at+ceus? //0:voice centric 1:data centric
+CEUS: 1

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