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Overview

Webhooks let your Callin agent interact with external systems in real time. This means that every time your agent makes or receives a call, it can automatically send or request data from another service using a simple HTTP request. This is useful when you want your agent to fetch customer information, create records in external tools, or trigger automations — all during a live conversation. In Callin, Webhooks are created as Tools, which are reusable components you can assign to any voice agent.

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Step 1: Create a Webhook Tool

To begin, you’ll need to create a new Tool inside the Callin dashboard:
  1. Go to Tools in your Callin workspace.
  2. Click on + Add Tool.
  3. Fill in the following fields:
    • Name: get-customer-data
    • Description: Retrieves customer information by phone number.
    • Method: Choose GET if you’re retrieving data, or POST if you’re sending it.
    • URL: Provide the external API endpoint, e.g. https://api.mycompany.com/customers
✅ Make sure the URL uses HTTPS and is publicly accessible. Otherwise, the webhook won’t work.
  1. Click Save to create the Tool.

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Step 2: Assign the Tool to a Voice Agent

Once your Tool is created, you need to connect it to the agent that will use it:
  1. Navigate to AI Agents.
  2. Choose the agent you want to configure.
  3. Scroll to the Tools section and click + Add Tool.
  4. Select the Tool you just created and save your changes.
Now, your agent is equipped to run this webhook whenever it’s needed during a call.

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Step 3: Test Your Webhook

Before using it in production, it’s important to test that your webhook is correctly configured. You can use Webhook.site — a free tool that gives you a temporary URL to receive test requests and inspect the data. Here’s an example of a payload Callin might send: “call_id”: “ab12cd34”, “agent_name”: “Laura AI”, “duration”: 145, “direction”: “outbound”, “caller_number”: “+34123456789”, “summary”: “Customer requested a follow-up.” Check that the payload arrives and matches what your external API expects.

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Step 4: Automate with Other Platforms

Once your webhook works, you can plug it into automation tools like:
  • Zapier: Trigger automations in 3,000+ apps.
  • n8n: Build conditional flows and advanced workflows visually.
  • Make.com: Design powerful scenarios without writing code.
These tools can take your webhook response and send Slack messages, create CRM leads, trigger emails, and much more.

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Common Errors and How to Fix Them

ProblemLikely CauseSolution
Missing webhook URLURL field is emptyAdd a valid HTTPS endpoint
Tool doesn’t runNot assigned to the agentGo to agent > Tools tab > re-assign Tool
No data receivedAPI is not reachableTest URL using Webhook.site
Timeout errorAPI takes too longIncrease webhook response timeout in Tool

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Final Tip

Webhooks are one of the most powerful ways to extend what your Callin agent can do. Start with something simple:
Set up a GET webhook to fetch customer details by phone number. Once that works, move on to advanced flows with Zapier, n8n, or Make.com. By combining real-time voice with automation, your AI agent can not only talk — it can fetch data, trigger actions, and drive outcomes across all your tools.