Bring your own orchestration: the sync HTTP pattern for voice agents

Sophisticated voice-agent teams are increasingly opting for the sync HTTP pattern over WebSockets for speech-to-text (STT) processing, which involves sending audio as plain HTTP requests for each conversational turn. This approach is particularly appealing for teams that already manage their own voice-activity detection (VAD) and aim for a uniform stateless architecture that is easy to scale, load-balance, and debug. Although this pattern introduces slightly higher per-turn latency compared to streaming, it simplifies the architecture by removing the need to maintain a persistent connection and manage streaming state. This design is especially suitable when teams want to own the orchestration and maintain control over the integration of STT, language models (LLM), and text-to-speech (TTS) services. However, for those who prefer a managed pipeline, the Voice Agent API offers a comprehensive solution with built-in turn detection and other features.

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