Hello, I would like to know which is the most correct procedure to set APN for TCP/IP contexts (Data) and for services such as VoLTE. I saw that APN can be set both with the AT + QICSGP command (APN with usr and pwd) and with the AT + CGDCONT command (APN without usr and pwd). From some Tests, it occurs that using the AT+QICSGP command to set APN for the TCP/IP context, the APN parameter of.. AT+CGDCONT=1,"IP","tim.br" to configure APN, and then. ATD*99***1# to actually connect. This will open a PPP session, and the username and password is usually provided over PAP in the PPP session itself, so you'll need to put them in your PPP client.

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AT+CGDCONT=1,"IP","em" [ To define PDP Context ] AT+CSQ [ to measure signal quality ] AT+CGACT=1,1 [ To activate a PDP context ] AT+CGDCONT? [ To return the current state of the PDP context] AT+CGACT=0 [ To deactivate a PDP context ] *Please check with the module vendor for the exact AT commands.. A special form of the write command, AT+CGDCONT= causes the values for context number to become undefined. If the initial PDP context is supported, the context with =0 is automatically defined at startup, the parameters for =0 can be modified with AT+CGDCONT. If the initial PDP context is supported, AT+CGDCONT=0 resets.