Audio conversation. A conversation is classified as an audio conversation if any request has STT input audio or any response has TTS output audio.
TEXT
Text conversation. A conversation is classified as a text conversation if any request has text input and no request has STT input audio and no response has TTS output audio.
UNDETERMINED
Default conversation type for a conversation. A conversation is classified as undetermined if none of the requests contain text or audio input (eg. event or intent input).