How One Developer Built Reliable Human Interruption for 8-Voice AI Group Calls

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A developer built AI Group Call, a mobile app that places up to eight AI voices — including Claude, GPT, Gemini, and Grok — on a single live voice call to help users think through ideas. The biggest technical challenge was not coordinating multiple AI speakers but enabling humans to reliably interrupt them mid-conversation. The solution involved custom energy-based voice activity detection on raw audio, a server-side conductor model to manage speaker turns, and layered echo cancellation after Android devices caused AI voices to loop back into the microphone. Multiple safeguards were stacked across capture, client, server, and transcript levels to distinguish genuine human speech from echo or background noise. The system prioritizes pausing an AI briefly over the far costlier mistake of talking over a human.

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