Anyone know of a way to manually stop the assistant from talking without it responding? Via the API. The VAPI interruption mechanism is too sensitive to background chatter, so I'm instead only allowing the user to interrupt with a specific trigger word. I've tried sending

system

messages with various prompts such as

I am interrupting you. Listen to me. Do not respond.

And I do then get a

user-interrupted

message back. But then it always responds with e.g. "Sure, I'll be here when you're ready to chat" while the user's trying to speak.