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How to connect CallOnTheGo to Claude

Connect Claude Web, Desktop and Cowork to CallOnTheGo MCP. List active phone numbers and statuses, create a voice campaign with audio, and more using natural language, with authentication handled for you.

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CallOnTheGo is a telephony API for managing phone numbers, caller IDs, suppression lists, audio assets, contact lists, and Voice AI campaigns. It provides programmatic control over calling infrastructure and campaign automation for scalable voice outreach.

29 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 CallOnTheGo account to Claude via Composio Connect, enabling it to list active phone numbers and statuses, create a voice campaign with audio, add number to suppression list, 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 CallOnTheGo with

ChatGPT WorkHermes

Connecting CallOnTheGo to Claude Web, Desktop, and Cowork

1. Open Customize

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

2. Add the Composio MCP server

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

3. 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

4. Connect your CallOnTheGo account

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

For example, ask Claude to:

  • "List active phone numbers and statuses"
  • "Create a voice campaign with audio"
  • "Add number to suppression list"

It will prompt you to authenticate and authorize access.

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

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

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

Troubleshooting

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

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

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

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

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

  • 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 CallOnTheGo.
  • If it fails again, send the error and the ofid_ reference id to support@composio.dev.

3. Why does the CallOnTheGo authorization link not work?

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

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

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

The CallOnTheGo connection can expire or lose permission.

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

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

Claude can manage the CallOnTheGo connection for you.

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

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

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

  • In Claude Desktop, open Customize > Connectors.
  • Next to Composio, click ⋮ and click Clear cache.
  • If CallOnTheGo 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 CallOnTheGo.
TOOLS

Supported Tools

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

Add Suppression Entry

Idempotently add one phone number to the Do-Not-Call list.

Cancel Campaign

Irreversibly cancel a campaign and mark its queued or pending recipients cancelled.

Create Caller ID

Add a caller ID and initiate a telecom-provider verification call to confirm ownership.

Create Campaign

Create a draft Voice AI campaign from explicit caller ID, contact list, and audio resources.

Delete Caller ID

Permanently remove an owned caller ID configuration.

Delete Phone Number

Permanently remove an owned phone-number configuration by ID; deleting a missing ID also reports success.

Get Campaign

Get one campaign's configuration, lifecycle state, resource names, delivery metrics, and cost metrics.

Get Dashboard Stats

Return account-level call, contact, group, list, success-rate, and recent-activity summary metrics.

Get Voice Readiness

Return runtime readiness, telecom provider assignment, and supported capabilities for diagnosing whether voice campaigns can run.

Launch Campaign

Validate compliance, provision telecom isolation if needed, and launch a campaign.

List Audio Assets

List campaign audio assets with playback, duration, transcript, and compliance details.

List Caller IDs

List owned caller IDs with ownership-verification status and inbound-campaign assignment.

List Calls

Return one page of account call records for outcome and duration review, with an opaque cursor for the next page.

List Campaign Events

List only the newest 100 delivery events for a campaign, ordered newest first.

List Campaign Recipients

List all recipients for a campaign with call status, attempts, machine detection, and cost estimates.

List Campaigns

List Voice AI campaigns with lifecycle state, linked resources, calling window, rate, estimated cost, compliance state, and timestamps.

List Contact Lists

List campaign contact lists with valid, invalid, suppressed, and total recipient counts.

List Contacts

Return one page of contacts from the connected CallOnTheGo account for CRM lookup, with an opaque cursor for the next page.

List Phone Numbers

List phone numbers owned by the connected CallOnTheGo account, including the resource records needed to identify numbers for later management.

List Suppression Entries

List Do-Not-Call suppression entries for the connected account.

Pause Campaign

Pause a running campaign while retaining its pending recipients for a later resume.

Queue Campaign Lead

Queue one phone-number lead for dialing by a running campaign.

Resume Campaign

Resume a paused campaign and immediately requeue its pending recipients for calls.

Set Caller ID Inbound Campaign

Set or clear the preferred inbound campaign assigned to an owned caller ID.

Update Campaign

Update selected configuration fields on a draft or paused campaign.

Upload Audio Asset

Upload an MP3 or WAV file as a reusable campaign audio asset.

Upload Contact List

Create a campaign contact list from a CSV file.

Upload Suppression CSV

Persistently add many phone numbers to the Do-Not-Call list from a CSV file.

Verify Caller ID

Submit an ownership-verification code for an existing caller ID and return whether it became verified or remains pending.

FRAMEWORKS

How to build CallOnTheGo MCP Agent with another framework

ChatGPT Work logo

ChatGPT Work

Use CallOnTheGo MCP with ChatGPT Work

Hermes logo

Hermes

Use CallOnTheGo MCP with Hermes

FAQ

Frequently asked questions

With a standalone CallOnTheGo MCP server, the agents and LLMs can only access a fixed set of CallOnTheGo tools tied to that server. However, with the Composio Tool Router, agents can dynamically load tools from CallOnTheGo 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 CallOnTheGo tools.

Yes, absolutely. You can configure which CallOnTheGo 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 CallOnTheGo data and credentials are handled as safely as possible.

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