# How do I assign an extension?

{% tabs %}
{% tab title="sipgate classic" %}
With an extension, all users in your account can reach each other without having to dial the full phone number of the respective user. You also need extensions for your users if you want to use the presence display. For snom phones, you also need the extension to configure the[ busy lamp field.](https://help.sipgate.de/hc/de/articles/4403611171473/live_preview/01K6FVTRNS1EMQ5JJTDSBERDYM)

You can assign extensions if you are logged in as **admin** logged in. Users can have multiple internal extensions, but only one extension per routing.

**This is how you assign an extension to a user:**

First open the **account management** and click the tile in the top left **User.** Now select the desired **user** and then click on **Edit** and then on **Add extension.** Then add the desired extension.

{% hint style="info" %}
Important: For **mobile phones** internal extensions should always **be three or four digits** long.
{% endhint %}

Click on **Save** and then in the overview on **Finish editing.**

**Assign extensions to groups**

To assign a phone number or an internal extension to a group, go to the [group overview](https://app.sipgate.com/groups) and select the desired group. You can add the desired extension via Edit routing in Visual Routing.

**Account management → Groups → Select groups → Edit routing → Phone number** and **Add extension**
{% endtab %}

{% tab title="sipgate neo" %}
Extensions for individual lines can only be assigned by **Admins** of the account. As an admin, go in account management to the tile **user** and click the user for whom you want to assign an extension. In the user's personal routing, you will see the assigned phone number in the upper area and the button for assigning an extension to the right of it. Click the Extension button and enter the desired extension there. Please make sure that you assign each extension only once. With one click on **Save** the extension is assigned to the corresponding user.

Extensions can also be assigned to **shared channels** Go to the menu item **Channels** and select the desired channel. The extension is then assigned in the same way as for the personal channels of individual users.
{% endtab %}
{% endtabs %}

<details>

<summary><strong>The following digit sequences cannot be assigned for technical reasons:</strong></summary>

* 110 (police emergency number Germany)
* 111 (emergency number New Zealand)
* 112 (fire and rescue emergency number Germany)
* 113
* 114
* 115 (government information number Germany)
* 116
* 117
* 118
* 119
* 211
* 311
* 411
* 511 (USA hotline number)
* 611
* 711 (USA long-distance directory assistance)
* 811
* 911 (emergency number USA)
* 999 (emergency number UK)
* 9900-9999

</details>

All users of the account can reach each other via the extension. Note that extensions from a mobile phone must be terminated with \*. So if you want to reach extension 10 from a mobile phone, for example, dial 10\* to call the line.


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