> 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/ai-agents/en/behavior/stimme-and-sprache.md).
# Voice & language
In this area, you define how your AI telephone assistant sounds and how it speaks to callers. The settings for voice, language, and greeting apply to all conversations of this AI agent and can be adjusted at any time.
### Select AI agent language
Choose the language in which your agent should conduct conversations. Available options: German, English, Spanish, French, Polish, Dutch, Arabic, Turkish, Russian.
The language determines how your agent understands and responds to callers. The agent always replies in the set language, regardless of which language the caller speaks.
{% hint style="info" %}
**Note:** If your company regularly receives calls in different languages, it is recommended to set up a separate agent for each language.
{% endhint %}
### Choose voice
Choose a voice that suits your company and target audience. The voice affects how professional and understandable the agent is perceived to be.
#### Recommended voices
There are many voices to choose from. So you don't have to test them all yourself, our Conversation Experience Team has evaluated the voices for clarity, pronunciation, and naturalness, including more complex content such as numbers, URLs, anglicisms, or spontaneous colloquial speech. These four voices stood out in particular:
| Voice | Language | Character |
| -------- | -------- | --------------------- |
| Philipp | German | Neutral & reliable |
| Ramona | German | Calm & professional |
| Benjamin | German | Efficient & clear |
| Laura | German | Direct & professional |
{% hint style="info" %}
**Note on proper names:** Company, street, and technical terms are pronounced differently depending on the voice. Test your agent with a test call before using it. If a voice does not pronounce your company name correctly, switch the voice.
{% endhint %}
#### One language or several?
Choose the voice that sounds most natural for your use cases. Test the desired voice before use with typical conversation scenarios, especially if numbers, proper names, or technical terms come up frequently. Differences are best seen in practical use.
{% hint style="success" icon="envelopes" %}
**Questions or feedback about voices?**
The Conversation Experience Team can help: [**stimmen-feedback@sipgate.de**](mailto:stimmen-feedback@sipgate.de)
{% endhint %}
### Set form of address
Define whether your agent should address callers with **Sie** or **Du** .
* **Sie** (Formal): suitable for customer service, B2B, and conservative industries
* **Du** (Informal): suitable for modern companies and younger target groups
The chosen form of address determines only the use of **“Sie”** or **“Du”**. It does not affect the agent’s general language style. Polite and respectful behavior is standard regardless of the chosen form of address.
The form of address applies to all conversations of this agent and should match your company communication.
### Customize greeting text
You can define the greeting text of your AI agent individually and adapt it to your company communication.
{% hint style="warning" %}
**Important:** The greeting text must include a note that it is a digital service. The text is reproduced verbatim, regardless of the set language.
{% endhint %}
### **Barge-in**
With barge-in, you determine whether callers can interrupt the AI agent while it is speaking. If the function is active, the agent stops immediately as soon as the caller speaks and listens. This makes conversations more natural and reduces waiting time.
**Where do I find the setting?**
In the logged-in area under Account management → AI Agents → Select agent → Agent settings. Depending on the account configuration, the function may first need to be activated. If you have any questions, contact sipgate customer support.
**Which options are available?**
Under the interruption item, choose between two settings:
* **Agent speaks to the end without interruption:** The agent cannot be interrupted while answering and speaks its contribution to the end in full.
* **Caller can interrupt agent:**
* As soon as the caller speaks, the agent stops and listens.
* The greeting message is excluded from this and cannot be interrupted for data protection reasons.
* If the agent is interrupted, the already generated response remains visible in the transcript, even if it was not fully spoken.
{% hint style="info" %}
**Note:** Barge-in is not enabled by default. To allow callers to interrupt the agent, you must select and save the corresponding option in the agent settings.
{% endhint %}
### Response time during silence
The response time during silence determines how long the AI agent waits after the caller has stopped speaking.
It is set by default so that conversations feel as natural as possible. If your agent responds too quickly or too slowly, contact [**customer support**](https://www.sipgate.de/kontakt). The response time can be adjusted if needed.
### Enable background noise (optional)
Optionally, background noise can be enabled, such as office sounds. This setting shapes the atmosphere of the conversation and can create the impression of a real workplace.
### Language of the conversation summary
Set the language in which conversation summaries are created.
**Example:** Your agent conducts conversations in English, but your team works in German. Set the summary language to German, so all employees can use the transcripts directly.
---
# Agent Instructions
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