How to playback audio via RingCentral API

Is there any way to play audio through a RingCentral call via the API. For example, to use the CallOut endpoint to make a call and have some sort of text-to-speech software say "Welcome to a call from <name>". I looked into perhaps using the Auto Receptionist feature to do this, but I couldn't figure out a way to automatically change the text the Auto Receptionist says without changing it manually.