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How to connect Callback24 MCP with ChatGPT

Connect ChatGPT 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

How to connect Callback24 MCP with ChatGPT

ChatGPT can take action across your apps and files, stay with a project for hours, and turn a goal into finished materials like sheets, slides, and docs, not just answers.

In this guide, I will explain the easiest and most secure way to connect your Callback24 account to ChatGPT via Composio Connect, so it can place outbound calls, manage users and permissions, update services, configure routing groups, and fetch call logs through natural language commands without ever putting your account credentials at risk.

Also integrate Callback24 with

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Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's Callback24 integration lets ChatGPT take actions like creating drafts, sending updates, labeling records, and more.
  • 1,500+ SaaS toolkits out of the box. Composio gives you instant access to a vast catalog of pre-built connectors, from Gmail and Slack to Notion, Linear, and Salesforce.
  • One MCP server for every app. Connect any of your applications on demand through a single endpoint, rather than juggling a separate server for each app.
  • Smart, context-aware tool loading. Unlike traditional MCP servers that dump every available tool into the LLM context window, Composio searches for and loads only the tools relevant to the task at hand.
  • Cross-app automation. Chain actions across multiple apps in a single run - fetch a thread, summarize it in Notion, and post highlights to Slack without leaving the conversation.

Prerequisites

Note: Composio connects through OAuth. You will be asked to sign in and approve specific permissions. Review the permission screen carefully if you are using a work account.

Step-by-step: Connect Callback24 to ChatGPT

1. Install the Composio plugin

Click the button. ChatGPT opens the Composio plugin page. Click Install plugin.

Install in ChatGPT

Composio plugin page in ChatGPT with the Install plugin button

You can also find it inside ChatGPT: go to Settings, open Plugins, search the marketplace for Composio, and click Install plugin.

2. Authenticate

After you install, ChatGPT asks you to authenticate with Composio. Log in and click Allow access to authorize ChatGPT to use your Composio account.

Composio login and Allow access screen for ChatGPT

3. Start using Composio

That is it. Composio tools are now available in ChatGPT. Type @Composio followed by your request, for example @Composio find unread Callback24 messages and summarize them, and it will run the actions you authorize. On first use it asks you to authorize Callback24.

Option 2: Add Composio as an MCP server

If you cannot use the plugin marketplace, add Composio as a custom MCP server instead.

1. Open the MCP settings

In ChatGPT, go to Settings and open the Plugins section. Inside the Plugins page, click the MCP tab.

ChatGPT settings showing the Plugins page with the MCP tab selected

2. Add the server

Click Add server. In the Name field enter Composio, for Type select Streamable HTTP, and in the URL field paste the Composio MCP server URL:

bash
https://connect.composio.dev/mcp
ChatGPT Add server dialog with the name Composio, type Streamable HTTP, and the Composio MCP URL

Then click Save. The Composio server now appears in your MCP plugins list.

ChatGPT Plugins page showing the Composio MCP server added to the list

3. Authenticate

Click Authenticate on the Composio entry, log in via Composio, and click Allow access. Composio tools are then available in ChatGPT the same way as with the plugin.

What you can do after connecting Callback24

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

Security + privacy notes (important)

  • Use least-privilege access: Only grant permissions you actually need.
  • Review OAuth permissions before approving: Make sure requested scopes match what you expect Composio and ChatGPT to do.
  • Keep write actions human-reviewed: For actions like sending messages, creating labels, or editing drafts, keep manual confirmation enabled.
  • Be careful with sensitive data: Avoid using this setup with highly sensitive information unless allowed by your personal, company, or client policies.
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

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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. ChatGPT 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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