> ## Documentation Index
> Fetch the complete documentation index at: https://docs.voicemetrics.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Function Calling (Actions)

> Actions are the automation tools behind your voice agent. They allow your agent to perform tasks, not just talk, such as booking appointments, transferring calls, sending emails/SMS, and even triggering custom workflows via API. Think of Actions as “function blocks” that you can link to your agent’s prompt. When the prompt calls an Action, it’s like pressing a button to get something done automatically.

## **Why Use Actions?**

Without Actions, your agent is limited to just conversation.

With Actions, your agent can:

* Automatically check calendar availability and book appointments
* Transfer calls to real humans
* Collect and send lead data
* Send confirmation SMS or emails
* Trigger CRM/webhook integrations and much more

<Note>
  **Use Actions to turn conversations into conversions.**
</Note>

## **Available Action Types**

1. **End Call Action**
   * Gracefully ends the conversation when the agent completes its task.
2. **Call Transfer Action**
   * Transfers the call to another phone number, agent, or department.
3. **Calendar Booking Action**
   * Book an appointment using your connected calendar service.
4. **Extract Call Info Action**
   * Captures caller details like name, email, or custom inputs during the conversation.
5. **Send Call Event Action**
   * Triggers a webhook or event immediately after the call ends (e.g., to CRM or automation platforms).
6. **Send Email Action**
   * Send an email during or after the call with relevant information.
7. **Send SMS Action**
   * Sends a text message automatically (e.g., confirmation, links, updates).
8. **Custom Action**
   * Executes custom API calls or workflows defined by your client.

<img src="https://mintcdn.com/voicemetrics-47a09903/m4bGCsYfa1JcNo2B/images/calendar.jpg?fit=max&auto=format&n=m4bGCsYfa1JcNo2B&q=85&s=40923068ea0aac76b6cf49de1b781762" alt="calendar.jpg" width="1920" height="1079" data-path="images/calendar.jpg" />

## **How It Works**

1. **Create Actions**
   * From the **Actions tab** in the client account, you can create any of the supported action types.
2. **Link to Prompt**
   * Inside your agent’s prompt, reference the Action by using the defined name (e.g., #Send\_SMS or #Book\_Calendar).
3. **Trigger Automatically**
   * When the agent reaches that part of the conversation, the linked Action will execute in real time.

<CodeGroup>
  ```Example Prompt (Using Actions) theme={null}

  Hi, thanks for calling.
  Ask for the caller's name and phone number.
  Use #Book_Calendar to schedule a meeting.
  After booking, use #Send_SMS to send confirmation details.
  Say goodbye and use #End_Call to finish the call.
  ```
</CodeGroup>

<img src="https://mintcdn.com/voicemetrics-47a09903/m4bGCsYfa1JcNo2B/images/Screen_061.jpg?fit=max&auto=format&n=m4bGCsYfa1JcNo2B&q=85&s=7d16358c04f8ef8b90bda40d5fa5055a" alt="Screen_061.jpg" width="1920" height="1080" data-path="images/Screen_061.jpg" />

<Note>
  Each Action must be **created and configured first** before linking it in the prompt.

  * You can reuse Actions across multiple agents.
  * **Custom Actions** allow powerful API-based workflows tailored to your client's business logic.
</Note>