​
Overview

TwilioFrameSerializer enables integration with Twilio’s Media Streams WebSocket protocol, allowing your Pipecat application to handle phone calls via Twilio’s voice services with bidirectional audio conversion, DTMF event handling, and automatic call termination.

Twilio Serializer API Reference

Pipecat’s API methods for Twilio Media Streams integration

Example Implementation

Complete telephony examples with Twilio

Twilio Documentation

Official Twilio Media Streams documentation

Twilio Console

Manage phone numbers and Media Stream configuration

​
Installation

The TwilioFrameSerializer does not require any additional dependencies beyond the core Pipecat library: 
pip install "pipecat-ai"

​
Prerequisites

​
Twilio Account Setup

Before using TwilioFrameSerializer, you need:
  1. Twilio Account: Sign up at Twilio Console
  2. Phone Number: Purchase a Twilio phone number with voice capabilities
  3. Media Streams: Configure your phone number to use Media Streams
  4. Webhook Configuration: Set up webhook endpoints for call handling

​
Required Environment Variables

  • TWILIO_ACCOUNT_SID: Your Twilio Account SID for authentication
  • TWILIO_AUTH_TOKEN: Your Twilio Auth Token for API operations

​
Required Configuration

  • Stream SID: Provided by Twilio during Media Stream connection
  • Call SID: Required for automatic call termination (optional)

​
Key Features

  • Bidirectional Audio: Convert between Pipecat and Twilio audio formats
  • DTMF Handling: Process touch-tone events from callers
  • Auto Hang-up: Terminate calls via Twilio’s REST API
  • μ-law Encoding: Handle Twilio’s standard audio encoding format