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How to connect CallOnTheGo MCP with ChatGPT Work

Connect ChatGPT Work 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

How to connect CallOnTheGo MCP with ChatGPT Work

ChatGPT Work is an agent inside ChatGPT built for your most ambitious work. It takes action across your apps and files, stays with a project for hours, and turns 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 CallOnTheGo account to ChatGPT Work via Composio Connect, so it can manage phone numbers, update caller IDs, maintain suppression lists, upload audio assets, and run voice AI campaigns through natural language commands without ever putting your account credentials at risk.

Also integrate CallOnTheGo with

Claude CoworkHermes

Why use Composio over default connectors?

  • Apps with read and write access. Default connectors mostly can read your data. Composio's CallOnTheGo integration lets ChatGPT Work take actions like creating drafts, sending updates, labeling records, and more.
  • 1,000+ 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

  • A ChatGPT account with access to ChatGPT Work (rolling out across Pro, Enterprise, Edu, Plus, and Business plans). We will use the ChatGPT desktop app, which is available on every plan.
  • Access to the CallOnTheGo workspace you want to connect.
  • Composio MCP.

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 CallOnTheGo to ChatGPT Work

1. Open the MCP settings

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

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

3. Authenticate

Click Authenticate, log in via Composio, and click Allow access to authorize ChatGPT Work to use your Composio account.

Composio login and Allow access screen for ChatGPT Work MCP setup

4. Start using Composio

That is it - Composio tools are now available in ChatGPT Work. Ask it to work with your CallOnTheGo account and it will run the actions you authorize.

What you can do after connecting CallOnTheGo

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

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 Work 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 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

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Claude Cowork

Use CallOnTheGo MCP with Claude Cowork

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. ChatGPT Work 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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