Elevenlabs Twilio Memory Bridge

---
name: elevenlabs-twilio-memory-bridge
description: "FastAPI personalization webhook that adds persistent caller memory and dynamic context injection to ElevenLabs Conversational AI agents on Twilio. No audio proxying, file-based persistence, OpenClaw compatible."
---

# elevenlabs-twilio-memory-bridge

Personalization webhook service for ElevenLabs + Twilio voice agents with persistent caller memory.

## What It Does

When a call arrives on your Twilio number, ElevenLabs' native integration triggers this webhook. The bridge looks up the caller's history, loads long-term memory facts and daily context notes, combines them with a customizable soul/personality template, and returns everything as a system prompt override so your agent greets each caller with full context.

## Architecture

- **No audio proxying** - ElevenLabs and Twilio handle media directly
- **Webhook only** - called once per inbound call to inject context
- **File-based persistence** - JSON files in `./data/`, zero external dependencies
- **OpenClaw compatible** - works with any OpenAI-compatible LLM endpoint

## Endpoints

| Endpoint | Method | Purpose |
|----------|--------|---------|
| `/webhook/personalize` | POST | ElevenLabs calls this on inbound call |
| `/webhook/post-call` | POST | Optional post-call cleanup |
| `/api/memory/{phone_hash}` | POST | Add long-term fact about a caller |
| `/api/notes` | POST | Add global or caller-scoped context note |
| `/health` | GET | Health check |

## Setup

1. Clone repo, `pip install -r requirements.txt`
2. Copy `.env.example` to `.env`, fill in secrets
3. Configure ElevenLabs agent with Custom LLM pointing to your OpenClaw instance
4. Enable system prompt + first message overrides in agent Security settings
5. Add webhook URL `https://your-domain/webhook/personalize` in ElevenLabs settings
6. Import Twilio number in ElevenLabs dashboard
7. Run: `uvicorn app:app --host 0.0.0.0 --port 8000`

## Required Environment Variables

- `ELEVENLABS_API_KEY` - scoped ElevenLabs key
- `ELEVENLABS_AGENT_ID` - your agent ID
- `OPENCLAW_API_BASE_URL` - your OpenClaw instance URL
- `PUBLIC_BASE_URL` - publicly reachable URL of this service

## Security

- All caller phone numbers are SHA-256 hashed before storage/logging
- Secrets loaded exclusively from environment variables
- Optional HMAC webhook signature verification
- Safe for public GitHub repos, no secrets in source