#VoLTE
#Table of contents
#History
| Authors | Change description | Status | Modification date |
|---|---|---|---|
| Bartosz Reichel | Initial version | Draft | 2021.01.29 |
| Marcin Zieliński | Updated according to the most recent knowledge and implementation state | Draft | 2022.10.27 |
#Scope
This document defines how VoLTE is run on modem
#Introduction
Considerations on implementing / running VoLTE in the context of various operators will be included here. The mechanisms available in Quectel modems will be described.
#Current implementation
#VoLTE On flow
The current implementation only puts voice call in PS (Packet Switch) mode. Automatic selection of MBN files is used depending on the searched operator (assuming that ROW_Generic_3GPP will be selected for one not on the list). In the current implementation, the current state of VoLTE enablement is checked and then a modem restart is performed only if the current state doesn't match the request to enable/disable.
#Debug command
Command AT+QVOLTEDBG is not full documented but propably return all parameters needed by Quectel modem to setup for VoLTE. Here example of return (@ could be treat as AT+)
@+QNVFR="/nv/item_files/modem/mmode/voice_domain_pref"
+QNVFR: 03
@+QNVFR="/nv/item_files/modem/mmode/sms_domain_pref"
+QNVFR: 01
@+QNVFR="/nv/item_files/ims/IMS_enable"
+QNVFR: 00
@+QCFG="ims"
+QCFG: "ims",0,0
@+CGDCONT?
+CGDCONT: 1,"IP","internet","0.0.0.0",0,0,0,0
+CGDCONT: 2,"IP","","0.0.0.0",0,0,0,0
+CGDCONT: 3,"IPV4V6","","0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0",0,0,0,1
+CGDCONT: 5,"IP","internet","0.0.0.0",0,0,0,0
@$QCPDPIMSCFGE?
$QCPDPIMSCFGE: 1 , 0 , 0 , 0
$QCPDPIMSCFGE: 2 , 1 , 0 , 0
$QCPDPIMSCFGE: 3 , 1 , 0 , 0
$QCPDPIMSCFGE: 5 , 0 , 0 , 0
@+CIMI
260060031******
@+QCCID
+QCCID: 89480610500613*****
@+CSQ
+CSQ: 10,99
@+QNWINFO
+QNWINFO: "HSPA+","26006","WCDMA 900",2938
@+CGACT?
+CGACT: 1,1
+CGACT: 2,0
+CGACT: 3,0
+CGACT: 5,0
@+CGPADDR
+CGPADDR: 1,"100.***.***.***"
+CGPADDR: 2,"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"
+CGPADDR: 5,"0.0.0.0"
@+CVERSION
VERSION: EG25GGBR07A08M2G
Jun 13 2020 16:25:23
Authors: QCT
@+QMBNCFG="autosel"
+QMBNCFG: "AutoSel",0
@+QMBNCFG="list"
+QMBNCFG: "List",0,1,1,"ROW_Generic_3GPP",0x05010820,201905141
+QMBNCFG: "List",1,0,0,"VoLTE-ATT",0x0501033C,202004261
+QMBNCFG: "List",2,0,0,"hVoLTE-Verizon",0x05010141,202004091
+QMBNCFG: "List",3,0,0,"Sprint-VoLTE",0x05010205,201908141
+QMBNCFG: "List",4,0,0,"Commercial-TMO_VoLTE",0x05010505,201811231
+QMBNCFG: "List",5,0,0,"Telus-Commercial_VoLTE",0x05800C43,201912031
+QMBNCFG: "List",6,0,0,"Commercial-SBM",0x05011C18,202004211
+QMBNCFG: "List",7,0,0,"Commercial-DT",0x05011F1C,201905311
+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,201909261
+QMBNCFG: "List",11,0,0,"Volte_OpenMkt-Commercial-CMCC",0x05012071,202004161
+QMBNCFG: "List",12,0,0,"OpenMkt-Commercial-CT",0x05011322,202001171
+QMBNCFG: "List",13,0,0,"OpenMkt-Commercial-CU",0x05011505,202001171
+QMBNCFG: "List",14,0,0,"Telstra-Commercial_VoLTE",0x0580079E,202006101
+QMBNCFG: "List",15,0,0,"Commercial-KDDI",0x0501071D,202004041
+QMBNCFG: "List",16,0,0,"Commercial-DCM",0x05010D17,202006101
+QMBNCFG: "List",17,0,0,"Commercial-SKT_VoLTE",0x05012724,201907221
+QMBNCFG: "List",18,0,0,"Commercial-KT",0x05012C0D,202005071
OK