ElevenLabs Cloud Voice Agent with Asterisk SIP Integration

Cloud-Hosted Conversational AI with Custom Webhook Tools, SIP Trunk Routing, and Dynamic Call Context Injection

A production-tested guide to building an AI voice agent that answers live phone calls through your existing Asterisk PBX, using ElevenLabs Conversational AI as the brain and your own webhook server to inject per-call business context.

Table of Contents

Cloud vs Local Voice Agents

Architecture Overview

Prerequisites

ElevenLabs Account and API Setup

Creating Webhook Server Tools

The Webhook Server: DID Context API

The Webhook Server: Booking API

Creating the AI Agent via API

Writing the Agent Prompt

Asterisk SIP Trunk to ElevenLabs

Asterisk Dialplan Routing

Database Schema

The Complete Setup Script

Testing the Integration

Production Deployment Tips

Monitoring and Logging

Cost Analysis

Comparison: Cloud vs Local Voice Agent

Troubleshooting

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