How to play an audio file with sim800L

Hi, I’m new to the SIM800L, purchased a few modules to integrate into my alarm system and need it to play an audio file after dialing and connecting to a certain phone number.
I have a few ESP8266 based rf/wifi bridge devices running in my house and 433 mhz sensors talking to them. When a sensor is activated, the bridge sends via MQTT a message to another ESP8266 device which in turn triggers a siren.
What I need is to, rather than triggering a siren, establish a phone connection with a sim800L and play a warning audio file to the recipient. Is it possible with the sim800L? If so, which AT commands should I use to upload the audio file to the sim800L memory and play it? I’m not interested in SMS messages, just audio.
Thank you for your help.