How to Build Live Audio Rooms: Voice Chat Architecture, Features & Example

Live audio rooms combine a small group of two-way speakers with a larger receive-only audience, using an SFU media server to forward each speaker’s Opus-encoded audio efficiently and a signalling channel for functions such as hand raises, invitations, chat, and moderation. In VideoSDK, hosts and speakers use SEND_AND_RECV mode while listeners use RECV_ONLY, and promotion requires the listener’s app to switch its own mode after a host invitation. Expected features include remote muting, active-speaker indicators, recording, noise suppression, and reliable background audio, which requires specific iOS audio settings and Android foreground-service configuration. VideoSDK separates server-side API responsibilities, such as token and room creation, from client-side SDK duties including microphone handling and participant-mode changes, with support for Flutter, React Native, and JavaScript. Pricing as of September 2026 charges $0.001 per on-stage participant minute and $0.0005 per audio-only listener minute, making audience scale the dominant cost; a one-hour session with four stage participants and 500 listeners costs about $15.24 before recording. Default room capacity is 15 active speakers and 1,000 interactive listeners, though account-wide viewer quotas may require paid add-ons, and larger audiences may need additional rooms or HLS playback.

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