***

title: Phone Numbers & PSTN
subtitle: Use PSTN numbers for inbound entry points and outbound caller ID
--------------------------------------------------------------------------

## <Icon icon="fa-duotone fa-phone" /> Overview

To make and receive calls to public mobile and landline numbers, attach a phone number to your Voximplant application.
For inbound calls, this number is your entry point. For outbound PSTN calls, this number is your caller ID.

<a id="buy-a-number" />

## <Icon icon="fa-duotone fa-cart-shopping" /> Buy a number

<Steps>
  <Step title="Open Numbers in Control Panel">
    In [manage.voximplant.com](https://manage.voximplant.com), open **Numbers** from the main menu.
    ![Numbers section](https://files.buildwithfern.com/voximplant.docs.buildwithfern.com/41dd435842d4ca770ea19c290394004e69913f564025b31a6b5b0f87fa2b4f5f/docs/assets/getting-started/phone-numbers-menu.png)
  </Step>

  <Step title="Choose Buy a new phone number">
    Click **Buy a new phone number**.
    ![Buy a new number](https://files.buildwithfern.com/voximplant.docs.buildwithfern.com/341bd1fe8a17227486e5b42f980a494932a0dc4e5573884f67cf10115bc598e9/docs/assets/getting-started/phone-numbers-buy.png)
  </Step>

  <Step title="Filter and select number type">
    Choose country/region and select either real or test numbers.
    ![Phone number list](https://files.buildwithfern.com/voximplant.docs.buildwithfern.com/3b296223ba05b6f924561eee965db1aa16c929bca92df9f837e6a7a49008079c/docs/assets/getting-started/phone-numbers-list.png)
  </Step>
</Steps>

<Note>
  Some regions require additional verification steps to buy real numbers.
</Note>

<Note>
  Test numbers require extra dialing steps and cannot be used as outbound caller ID.
  We recommend starting with a real number.
</Note>

<a id="attach-number" />

## <Icon icon="fa-duotone fa-link" /> Attach the number to your application

<Steps>
  <Step title="Open your application">
    Go to **Applications**, select your app, then open the **Numbers** tab.
  </Step>

  <Step title="Attach number">
    Select an available number and click **Attach**.
    ![Attach a number to app](https://files.buildwithfern.com/voximplant.docs.buildwithfern.com/f71555f71f0b4f1e7fcbc2d832d1e55b670bcd7f86727cbad98d047c292f765f/docs/assets/getting-started/phone-numbers-attach.png)
  </Step>

  <Step title="Set routing rule">
    Attach a routing rule now or configure it after.
    ![Select routing rule while attaching](https://files.buildwithfern.com/voximplant.docs.buildwithfern.com/e0519f7b697a359b1425161d3a07aa7af9f3ceadc603547598e4278bf60fdc37/docs/assets/getting-started/phone-numbers-rule.png)
  </Step>
</Steps>

### Outbound specifics

For outbound PSTN, place calls with `VoxEngine.callPSTN(destination, callerId)` and use a valid rented/verified caller ID.

```js title="Outbound PSTN"
const call = VoxEngine.callPSTN("+15551234567", "+15557654321");
```

#### <icon icon="fa-duotone fa-solid fa-link" /> More information:

* [Phone numbers basic concepts](https://voximplant.com/docs/getting-started/basic-concepts/phone-numbers)
* [VoxEngine Call class](https://voximplant.com/docs/references/voxengine/call)
* [VoxEngine.callPSTN](https://voximplant.com/docs/references/voxengine/voxengine/callpstn)