How to Orchestrate Multi-Call Conversations with an LLM and Twilio Conversation Memory with PHP

Published September 11, 2026, this tutorial explains how to build a PHP voice agent that preserves caller context across separate Twilio phone calls using Twilio Conversation Memory, OpenAI, Open Swoole, and Conversation Relay. It walks through creating a PHP project, installing dependencies, configuring a Twilio Memory Store and API credentials, and implementing services that retrieve a caller profile by phone number, recall prior observations and summaries, and add that information to an OpenAI system prompt. The application uses a WebSocket server to receive transcribed caller prompts, stream GPT-4o-mini responses back to Twilio, retain in-call message history, and account for interruptions by removing incomplete assistant messages. It concludes with instructions for exposing the local webhook through ngrok, configuring a Twilio phone number, and testing whether the agent remembers auto-repair details during a second call from the same number, while noting that Conversation Memory is not intended for sensitive information.

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