Voice Assistant Responses (Microphone Wake Word, Speech-to-Phrase)

When I give a voice command, e.g., “Turn on the lamp,” I receive the correct response, “Lamp turned on.” However, if none of the configured voice commands in the automation are recognized, there is simply no response. How can I have the voice response “Command not understood!” play in such a case?

I have written an automation with “conversation” triggers for the individual voice commands.

triggers:
  - trigger: conversation
    command: stehlampe an
    id: lampe_an

What trigger is there if no command is recognized?

Listening >> processing >> responding

I believe this is the transition states of voice device from wake detected to responding

You can trigger on listening
With “if” not responding after 20 second

Are you using Speech-to-phrase? It does not respond when spoken phrase is not in its list

Whisper TTS will provide response when if doesn’t understand. But it also will make long gibberish statement as it repeats back what it thought it heard.