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Documentation Index

Fetch the complete documentation index at: https://docs.vobiz.ai/llms.txt

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This guide walks through connecting leading conversational AI platforms directly to real phone numbers using Vobiz.

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Introduction

An AI Voice Agent is a conversational system that can listen, process speech, and reply with human-like audio over a telephone call. Pairing Vobiz’s SIP and telecom infrastructure with providers like Vapi, Retell AI, or ElevenLabs lets you build powerful inbound customer support systems or outbound calling campaigns. Vobiz routes telephone audio (RTP streams) to these AI providers out of the box using standard SIP or WebSocket connections - no manual WebRTC stream handling required.

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How it works

The architecture of an AI Voice Agent generally consists of three parts:
1

The Telecom Layer (Vobiz)

Provides the actual phone number (DID), handles the SIP trunking, and manages the lifecycle of the phone call.
2

The Interconnect

Vobiz forwards the call to your server or directly to an AI integration platform using a SIP URI or a Stream (WebSocket).
3

The AI Layer

The AI provider (Vapi, Retell, Pipecat, etc.) runs Speech-to-Text (STT), routes context to an LLM, generates text, and converts it back using Text-to-Speech (TTS).

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Prerequisites

Before setting up your first agent, ensure you have:
  • A registered Vobiz account
  • An active phone number purchased in the Vobiz dashboard
  • An account with your preferred AI Voice provider

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Choose your AI provider

Vobiz supports all major AI voice platforms. Select the one that fits your stack and follow the step-by-step integration guide.

VAPI

Low-latency conversational AI via SIP.

Retell AI

Natural-sounding AI phone conversations.

ElevenLabs

Ultra-realistic AI voice agents.

Pipecat

Open-source Python voice AI framework.

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All integrations

View integrations page →

VAPI

Most popular

Retell AI

Natural conversations

ElevenLabs

Realistic voices

LiveKit

WebRTC + SIP

Pipecat

Open source

Bolna.ai

Production ready

Ultravox

Multimodal AI

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What’s next?

Build an inbound voice agent

Step-by-step setup for receiving calls and routing them to your AI agent.

Build an outbound voice agent

Run automated outbound campaigns with AI agents over Vobiz trunks.