Interface CompanionCallOptions

Element to route remote audio to. One is created if omitted.

OPT-IN full duplex: keep the mic OPEN while the companion speaks so the user can interrupt mid-utterance (both providers' native VAD interruption then works). Default false = half-duplex — the mic is muted during agent speech, because on phone SPEAKERS browser echo cancellation does not fully remove the companion's own voice and it barges in on itself (the SDK-voice "说一句就断了" field report). Enable only where AEC actually holds: headphones, desktop, or devices you have verified.

Open the call with the reader's microphone MUTED (0.69.0); see CompanionCall.setMuted. On openai-realtime the track is disabled before it is attached, so nothing is ever sent. On elevenlabs-convai the mute is applied the moment the session is up; the provider client has no start-muted option, so the connect handshake itself (before the agent's first line) can carry audio.

The call ended, and why (0.71.0). Fires exactly once per call, on every path including your own close(). Passing it moves a clean remote end (agent / remote) out of onError, so a hang-up is no longer reported as a fault. See CallEnd.

A failure that ended the call. Every onError is terminal: the call is already torn down. Without onEnd, a clean remote end (the companion or the provider hanging up) also arrives here as call disconnected.

One finished line. text never carries performed cues. On a call where audioTags was GRANTED (0.70.0), every companion line also carries audioTags: the cues it performed, in order ([] when it performed none). Absent on user lines and on calls without the grant, so absence means "not applicable", never "zero".