Command for audio playback in voice call

[Dan Williams]

On Wed, 2019-03-13 at 08:20 +0100, Stefano Cordibella wrote:
> Dear list,
>      I am new to the libqmi and I want to know if is it possible to
> play 
> a recorded file during a voice call.
> The command that I want to send is the equivalent to the AT:
> 
>   * AT+QPSND or
>   * AT+QPRESBG or
>   * AT+QPCMD

What modem are these commands for? A Quectel device perhaps?

Dan