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Conversation Relay

API service

by Twilio

Voice AI service that bridges a Twilio phone call to a developer's own LLM over a WebSocket, handling speech-to-text, text-to-speech, interruption handling and language detection.

Find alternatives to Conversation Relay

Listed on Twilio's Conversational AI pricing page as "Conversation Relay $0.07 / minute". Twilio channel usage (Voice minutes) and any third-party STT/TTS vendor charges are billed separately. Free trial account available.

What it does

• Voice agent
• Speech to text
• Text to speech
• Customer support

How it compares

Sources

Pricing

Pricing page · 4 Sep 2026

"$0.07 / minute".

Description

Official documentation · 4 Sep 2026

Sold within

Pricing page · 29 Sep 2026

Twilio's Conversational AI rate card prices Relay on its own line, with self-serve "Start for free"; voice minutes are billed as a separate product: "$0.07 / minute".

Also from Twilio

• AI Assistants Agent platform

  Framework for building customer-aware autonomous assistants across voice and messaging channels, with built-in customer memory, tool-calling, a managed RAG knowledge pipeline and safety guardrails.

• Conversation Memory API service

  Service that extracts observations from customer conversations across channels into identity-resolved profiles and exposes them to AI and human agents through a semantic-search recall API.

• Conversation Intelligence API service

  Applies prebuilt and custom language operators to live and recorded voice and messaging conversations to produce transcripts, sentiment, intent, summaries and agent-performance signals.

• Twilio Agent Connect Developer tool

  MIT-licensed Python SDK that acts as middleware between a developer's own LLM agent runtime and Twilio Voice, messaging channels, Conversation Memory and Conversation Orchestrator.

• Predictions Data service

  Predictive machine-learning traits in Twilio Segment that score customer profiles for likelihood to purchase, likelihood to churn, predicted lifetime value and custom goals, and turn those scores into audiences.

• Conversation Orchestrator Platform

  Engine that connects a customer's interactions across voice, SMS, RCS, WhatsApp, chat and other channels into one continuous conversation, so AI agents, workflows and human teams work from a shared context.

• Enterprise Knowledge API service

  Managed knowledge store that ingests an organization's policies, documents and reference material and serves grounded retrievals to AI agents and human responders inside Twilio Conversations.

• Twilio Agent Copilot Application

  Generative-AI assistant inside Twilio Flex that gives contact-center agents customer context, live suggested responses via "Ask Copilot," and AI-generated wrap-up notes with sentiment and disposition codes.

• Twilio Flex Application

  Composable AI-assisted contact-center platform that orchestrates escalation from automated self-service to human agents across voice, SMS, WhatsApp and email.

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