# Codec optimization

To Improve Audio Quality, specific Codecs should be selected:

<p class="callout info">Tested on P560</p>

### Code Priority

1. Opus
2. G722
3. µ-Law

### Set Codec for Trunk

1\. Go to Trunk Settings

[![image.png](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/scaled-1680-/71Nimage.png)](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/71Nimage.png)

2\. Go to Tab *Advanced* and change Codecs

[![image.png](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/scaled-1680-/teNimage.png)](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/teNimage.png)

### Set Codec in SIP Settings

1\. Go to SIP Settings

[![image.png](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/scaled-1680-/WWzimage.png)](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/WWzimage.png)

2\. Go to Tab *Codec*

[![image.png](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/scaled-1680-/gP7image.png)](https://kb.oliver-karger.de/uploads/images/gallery/2025-07/gP7image.png)