> For the complete documentation index, see [llms.txt](https://help.sipgate.de/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.sipgate.de/cloud-telefonanlage/en/using-sipgate/telefonie/was-ist-das-besetztlampenfeld-blf.md).

# What is the busy lamp field (BLF)?

Set up the busy lamp field (BLF) in sipgate – display colleagues' phone status on your own device.

If you want to view the **phone status** if you want to display colleagues' status on your own phone, the busy lamp field (BLF) is the feature of choice. It is included in the business L and XL plans. To use the function, each created user must have an **internal extension** assigned. Once correctly configured on the device, the BLF shows these three statuses:

* **available**: colleagues are not in a call, the busy lamp is off.
* **busy**: colleagues are on a call, the busy lamp lights up continuously.
* **ringing**: colleagues are currently being called, the busy lamp blinks.

BLF configurations vary from model to model.

You can find instructions for this on the manufacturers' websites and in the documentation that came with your phone.

We have tested BLF configuration on a wide range of phone models; here you will find the [configuration guide for Snom,](https://help.sipgate.de/hc/de/articles/4408426635921) the [configuration guide for Gigaset](https://help.sipgate.de/hc/de/articles/4408434099217), which [configuration guide for Yealink,](https://help.sipgate.de/hc/de/articles/4408427192081-BLF-Konfiguration-f%C3%BCr-Yealink) the [configuration guide for Tiptel](https://help.sipgate.de/hc/de/articles/4408427390481-BLF-Konfiguration-f%C3%BCr-Tiptel), which [configuration guide for Grandstream.](https://help.sipgate.de/hc/de/articles/4408427518097-BLF-Konfiguration-f%C3%BCr-Grandstream)

In your sipgate account, you can alternatively find under **My telephony** the [**Presence display**](https://help.sipgate.de/hc/de/articles/4408234555025).\
This shows you which users are currently available.

If a user is on a call, the corresponding tile is shown in red with the internal extension.

{% hint style="warning" %}
**Important:** All users must have an **internal extension** assigned.
{% 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://help.sipgate.de/cloud-telefonanlage/en/using-sipgate/telefonie/was-ist-das-besetztlampenfeld-blf.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.