> For the complete documentation index, see [llms.txt](https://teamhelp.sipgate.co.uk/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://teamhelp.sipgate.co.uk/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md).

# How can I set up Presence/BLF (Busy Lamp Fields)?

#### What is Busy Lamp Field (BLF)?

If you want to see the call status of your colleagues directly on your own phone, the **Busy Lamp Field (BLF)** feature is the ideal solution. It is included in the **business L** and **business XL** plans.

Before using BLF, each user must be assigned an **internal extension**. Once correctly configured on a VoIP device, BLF displays the following three statuses:

* **Free:** The user is not on a call, and the busy lamp is off.
* **Busy:** The user is on a call, and the busy lamp is solidly lit.
* **Ringing:** The user is receiving an incoming call, and the busy lamp is blinking.

The configuration of BLF varies depending on the phone model. You can find setup instructions in your phone's manufacturer documentation or on their websites.

**We have tested BLF on several phone models and provide configuration guides for the following brands**

* [Snom](/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md)
* [Gigaset](/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md)
* [Yealink](/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md)
* [Tiptel](/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md)
* [Grandstream](/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md)

#### Alternative: Presence display in your sipgate account

Instead of BLF, you can also check the **Presence Display** in your sipgate account under **My Telephony**. This shows which users are currently available.

If a user is on a call, their tile, including their internal extension, will be displayed in **red**.

{% hint style="info" %}
**Important:** Every User must be assigned an internal extension for BLF and Presence to function properly.
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://teamhelp.sipgate.co.uk/use-sipgate/telephony/how-can-i-set-up-presenceblf-busy-lamp-fields.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.