OptionalaudioOptionalbargeOPT-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.
OptionalonOptionalonOptionalon
Element to route remote audio to. One is created if omitted.