Type Alias VoiceEventType

VoiceEventType:
    | "user_start_speaking"
    | "user_stop_speaking"
    | "agent_start_speaking"
    | "agent_stop_speaking"
    | "user_interrupt"

All legal discriminant values for a VoiceEvent.

user_start_speaking / user_stop_speaking — VAD-detected user speech boundaries.
agent_start_speaking / agent_stop_speaking — TTS/stream playback boundaries for the agent.
user_interrupt — user barged in mid-agent-utterance.