Building Voice Agents with the OpenAI Realtime API
Build a production voice agent in Python that handles live audio, barge-in mid-sentence, function calls, phone-call attach over SIP, and live speech translation.
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21 chapters
Programming & Development
2026
From Building Voice Agents with the OpenAI Realtime API
Table of Contents
4 of 21 chapters available · Premium unlocks the rest
- 1 Legal Notices
- 2 About This Book
- 3 Part I: Foundations
- 4 Chapter 1: Realtime API Orientation
- 5 Chapter 2: Python Environment and Project Setup
- 6 Chapter 3: Realtime Sessions, Event Flow, and History Strategy
- 7 Part II: Core Voice Agents
- 8 Chapter 4: Building the First WebSocket Voice Agent with Live Audio
- 9 Chapter 5: Audio Chunking, Turn Detection, Manual Turns, and Interruption Handling
- 10 Chapter 6: Function Calling, Tool Authorization, and Voice-Safe Inputs
- 11 Part III: Specialized Realtime Models
- 12 Chapter 7: Streaming Transcription with gpt-realtime-whisper
- 13 Chapter 8: Live Translation with gpt-realtime-translate
- 14 Chapter 9: Telephony Integration with SIP Attach
- 15 Part IV: Production Architecture
- 16 Chapter 10: Browser WebRTC Boundaries and Server Sideband Control
- 17 Chapter 11: Observability, Evaluation, Cost Management, and Data Safety
- 18 Chapter 12: Deployment, Scaling, Reconnection, Operational Hardening, and End-to-End Case Study
- 19 Next Steps
- 20 Part V: Review Questions
- 21 Answer Key