Sending audio over intercom with an ESP8266

I have connected a ESPBell lite to an intercom

The intercom used is Fermax VEO 4+N. I want to add extra functionality where I can send a pre recorded audio message from ESPBell lite into the intercom when someone calls the number. How can I do so?

Probably you will need DF-Player mini — ESPHome and extra circuitry like an audio transformer…