What is the UserStartedSpeaking Message

The userStartedSpeakingmessage confirms when a user begins to speak.

Receiving UserStartedSpeaking

The server will send a UserStartedSpeaking message every time the user begins a new utterance. If the client is playing agent audio when this message is received, it should stop playback immediately and discard all of its buffered agent audio.

{
  "type": "UserStartedSpeaking"  
}

Conclusion

The UserStartedSpeaking message notifies the server that the user has begun speaking, prompting the client to stop any ongoing agent audio playback and discard any buffered audio, ensuring that the user's input is prioritized and processed immediately.