Note: Troubleshooting articles are only available in English.
no call control from Sennheiser headset (answer call, Hangup call and mute sync).
Sennheiser headset is designed to work together with another Software.
How to fix the issue:
it is required to install Sennheiser Headsetup Pro when using a Sennheiser headset with softphones. To keep a full integration between Rainbow and Sennheiser, the Rainbow application requires to be registered to Headset Pro when starting up. This software is free and available here:
The Rainbow application will be displayed in HeadsetupPro->Settings->Softphone-> Default Softphone