What are audio issues and what can I do about them?
The causes of crackling, stuttering, and completely failing audio can be divided into three subcategories: hardware (and DECT) issues, settings, and network issues. Sometimes it can be difficult to determine exactly what's causing a specific audio issue. This page provides you with tools to identify and resolve these issues. It is organized so that you can start troubleshooting from the top and learn how to solve your audio issues.
Troubleshooting tip: start by checking if device settings are causing the problems, then check the codec settings, and finally examine the network.
Toestel settings
Toestel settings
Codec instellingen 
Codec instellingen
