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How to connect Callback24 to Claude

Connect Claude Web, Desktop and Cowork to Callback24 MCP. Place an outbound call to +15551234 now, create voicemail transcription for latest call, and more using natural language, with authentication handled for you.

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Callback24 is a telephony API for managing phone calls, users, services, and routing groups. It centralizes call control and routing to automate voice workflows and operations.

27 Tools

Introduction

Claude is Anthropic's AI assistant, available on the web, in the desktop app, and on mobile. Cowork is its agent for knowledge work, and it runs on all of those surfaces too. Connected to your apps, Claude can work with your files and services to accomplish complex tasks on your behalf.

This guide walks you through the easiest and most secure way to connect your Callback24 account to Claude via Composio Connect, enabling it to place an outbound call to +15551234 now, create voicemail transcription for latest call, list active routing groups and members, and more such actions on your behalf without compromising your account security.

Setup is the same on Claude Web, Desktop, and Cowork, and you only need to do it once. The connector is tied to your account, so it's available in all three.

Also integrate Callback24 with

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Connecting Callback24 to Claude Web, Desktop, and Cowork

Two ways to add the Composio connector. Pick whichever you prefer.

1. Add with one click

Click the button. Claude opens with the Composio connector filled in. Click Add, then go to step 2.

Add to Claude

Add manually

In Claude Desktop, click Customize in the left sidebar, then select Connectors and click the + icon at the top.

Claude Desktop connectors screen with Add custom connector selected

Click Add custom connector and paste in the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
Add custom connector dialog with Composio MCP server URL

2. Authorize in your browser

Click Connect. You'll be redirected to a browser window where you can authorize Composio to continue.

Composio authorization screen for Claude Web, Desktop, and Cowork

3. Connect your Callback24 account

Back in Claude, ask it to connect to Callback24 or give it any Callback24-related task.

For example, ask Claude to:

  • "Place an outbound call to +15551234 now"
  • "Create voicemail transcription for latest call"
  • "List active routing groups and members"

It will prompt you to authenticate and authorize access.

That's it. Composio's tools are now available in Claude, and your Callback24 account is ready to use.

What is the Callback24 Claude Connector, and what's possible with it?

The Callback24 MCP server is an implementation of the Model Context Protocol that connects your AI agent and assistants like Claude, Cursor, etc directly to your Callback24 account. It provides structured and secure access so your agent can perform Callback24 operations on your behalf.

Troubleshooting

1. Why does Claude not use the Composio connector for Callback24?

The connector can show as connected, but Claude must use it in each Callback24 conversation.

  • Click + at the lower left of the chat, or type /.
  • Hover Connectors.
  • Turn on Composio.
  • Ask Claude to connect to Callback24 again.

2. Why does Claude show an MCP server error before Callback24 connects?

Claude can show Couldn't reach the MCP server or Authorization with the MCP server failed when you add the connector for Callback24.

  • Check that the connector URL is https://connect.composio.dev/mcp.
  • Connectors run from Anthropic's cloud, so your device network is usually not the problem.
  • Add the connector again from Customize > Connectors, then ask Claude to connect Callback24.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the Callback24 authorization link not work?

The Composio connector is one server. Your Callback24 account connects separately when Claude asks for it.

  • If the browser does not open, or the link expires, ask Claude to retry the Callback24 connection.
  • Composio creates a fresh Callback24 authorization link.
  • Open that link in your browser and finish the Callback24 sign-in.

4. Why do Callback24 actions fail after they worked before?

The Callback24 connection can expire or lose permission.

  • Ask Claude to inspect the Callback24 connection.
  • If the connection is unhealthy, disconnect it when Claude prompts you.
  • Reconnect the Callback24 account and retry the action.
  • If Claude shows a permission prompt, approve it before Claude changes data in Callback24.
  • If the action still fails with a permission error, check that the connected account has that permission in Callback24 itself.

5. How do I switch to a different Callback24 account?

Claude can manage the Callback24 connection for you.

  • Ask Claude to disconnect or delete the current Callback24 account.
  • Ask Claude to connect Callback24 again.
  • Open the new Composio authorization link for Callback24.
  • Sign in with the other Callback24 account in the browser.
  • After the account connects, ask Claude to retry the Callback24 task.

6. Why is my Callback24 connection missing in Claude Desktop or on a Team plan?

The connector belongs to your Claude account, so your Callback24 connection works in Claude Web, Desktop, and Cowork.

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If Callback24 tools still do not appear, click ⋮, disconnect, remove the connector, and add it again.
  • On Team or Enterprise, an Owner or Primary Owner must enable the connector before you can connect Callback24.
TOOLS

Supported Tools

Every Callback24 action and event your agent gets out of the box.

Assign User to Service

Assign a Callback24 user to a service, optionally within a routing group.

Batch Assign Users to Service

Sequentially assign 1-25 Callback24 users to one service.

Batch Remove Users from Service

Sequentially remove 1-25 users from a Callback24 service.

Cancel Upcoming Phone Calls

Irreversibly bulk-cancel every upcoming phone call matching a phone number or lead reference.

Create Group

Create a routing group within a Callback24 service, with optional localized names.

Create Phone Call

Create or schedule a real phone call in Callback24.

Create Service

Create a Callback24 service for a website.

Create User

Create a company user in Callback24.

Delete Group

Permanently and irreversibly delete one Callback24 routing group by group ID.

Delete Service

Permanently and irreversibly delete one Callback24 service and its associated routing and customer-facing widget configuration.

Delete User

Permanently and irreversibly delete one company user by Callback24 user ID.

Get Current User

Return the Callback24 user identity associated with the connected API token.

Get Group

Return one Callback24 routing group by ID with its service ID and localized names.

Get Phone Call

Return detailed metadata, tags, and assigned-user information for one Callback24 phone call.

Get Phone Call Recording

Return the recording URL for one recorded phone call.

Get Service

Return one Callback24 service with opening hours, routing groups, and assigned users.

Get User

Return one company user by Callback24 user ID.

List Groups

Return all Callback24 routing groups with their service IDs and localized names.

List Phone Calls

Return one page of phone-call history, optionally filtered by type, date range, phone number, users, or services.

List Services

Return all Callback24 services with their nested groups, assigned users, and opening hours.

List Users

Return all company users visible to the connected Callback24 account.

Remove User from Service

Remove a Callback24 user's assignment from a service, optionally within a routing group.

Update Group

Update one or more localized names for a Callback24 routing group.

Update Phone Call

Update editable metadata for an existing phone call without changing its explicit cancellation or start/end status fields.

Update Phone Call Status

Set a phone call's cancelled flag and/or recorded start and end times; this changes operational call state.

Update Service

Change the website configured for an existing Callback24 service.

Update User

Update one or more profile or role fields for an existing Callback24 company user.

FRAMEWORKS

How to build Callback24 MCP Agent with another framework

ChatGPT logo

ChatGPT

Use Callback24 MCP with ChatGPT

Hermes logo

Hermes

Use Callback24 MCP with Hermes

Atomic Agent logo

Atomic Agent

Use Callback24 MCP with Atomic Agent

FAQ

Frequently asked questions

With a standalone Callback24 MCP server, the agents and LLMs can only access a fixed set of Callback24 tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from Callback24 and many other apps based on the task at hand, all through a single MCP endpoint.

Yes, you can. Claude Cowork fully supports MCP integration. You get structured tool calling, message history handling, and model orchestration while Tool Router takes care of discovering and serving the right Callback24 tools.

Yes, absolutely. You can configure which Callback24 scopes and actions are allowed when connecting your account to Composio. You can also bring your own OAuth credentials or API configuration so you keep full control over what the agent can do.

All sensitive data such as tokens, keys, and configuration is fully encrypted at rest and in transit. Composio is SOC 2 Type 2 compliant and follows strict security practices so your Callback24 data and credentials are handled as safely as possible.

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