> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://onlinesolutions.crisp.help/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Unsupported Audio Device Error

When you see an error prompt "**Unsupported Audio Device**", this means the headset you are using is not compatible with the PhoneSpeak desktop app. To check on your computer setting, right-click on the sound icon at the Windows task bar


![](https://storage.crisp.chat/users/helpdesk/website/dc55cfd193a55800/1_1p85jyr.jpg)

It will launch the sound controller. Click on the **Recording **tab and select the default device. The one with a green tick icon. Click on the **Properties **button.


![](https://storage.crisp.chat/users/helpdesk/website/dc55cfd193a55800/2_jrxjw8.jpg)

It will launch the device properties. Click on the **Advanced **tab. Take a look at the Default Format. The desktop app supports the following sample rate and bit depth:

**- 16bit, 16KHz to 48KHz**

**- 24bit, 16KHz to 48KHz**

**- 32bit, 16KHz to 40KHz**


![](https://storage.crisp.chat/users/helpdesk/website/dc55cfd193a55800/3_1ms0jrl.png)