The supported Callflow Actions are:
makeCall- Initiates an outgoing call to the desired destination. This function should be used to connect the first call with another party.say- Generates and plays a TTS to the calling user.sayAndCapture- Plays a voice file in to the call and then captures users DTMF input and reports back the DTMF via Voice Call Action (VCA) webhook.playFile- Downloads the sound/voice file provided and plays it back in the currently active call.hangup- Disconnects all active calls. This will terminate the session, triggering the session summary webhook.