How to Build an AI Voice Agent using OpenAI Realtime API - RAG and Function Calling - Part 2

Learn to enhance an AI voice agent by implementing advanced features including RAG (Retrieval-Augmented Generation), function calling, caller history, and AI-first phone answering using OpenAI's Realtime API. Build upon foundational voice agent concepts by integrating sophisticated capabilities that enable the AI to retrieve relevant information, execute specific functions, maintain conversation context, and proactively initiate phone conversations. Explore the technical implementation through hands-on coding demonstrations covering Make.com automation workflows, Twilio API integration for phone functionality, configuration of function calls, and deployment strategies using Replit. Master the critical technique of programming AI to speak first in phone interactions, understand function call breakdowns for complex operations, and gain practical experience setting up development environments and testing voice agent functionality. Follow along with detailed code explanations, automation setup processes, and real-world deployment scenarios to create a production-ready AI voice assistant capable of handling sophisticated conversational tasks and external system integrations.