The code snippet

@ctx.room.local_participant.register_rpc_method("start_turn")

in LiveKit Agents 1.x is used to register a Remote Procedure Call (RPC) method that can be triggered by clients. This is particularly useful for implementing manual turn detection in voice AI agents, such as in push-to-talk scenarios. When this method is registered, it allows the agent to: • Interrupt any current agent speech using

session.interrupt()

• Clear any previous user input with

session.clear_user_turn()

• Set the agent to listen to the specific participant who called the method • Enable audio input using

session.input.set_audio_enabled(True)

This approach is part of a manual turn control system where the agent listens only when explicitly triggered by the client, rather than relying on automatic turn detection methods like VAD or STT endpointing. Sources: Tree View: | dse-workbench | Turn detection and interruptions | LiveKit Docs | Turn detection and interruptions | LiveKit Docs