You can use Jabra headset or call control unit accessory functional buttons Answer, Reject, Hangup and Hold\Unhold to control call.
1. Download and install Jabra Direct for Windows from Jabra official web-site.
2. Open Settings - Main section.
3. Enable Jabra headset integration checkbox:
4. Click Save button.
5. Test your Jabra headset functional buttons by making a test call in softphone.
1. Right-click the speaker icon in taskbar and choose Volume control options.
2. Сheck the box next to Jabra headset sound device. Click Save button.
3. If necessary, disable other audio devices except Jabra headset:
Click on the audio device icon which you want to disable in Volume mixer
Select Don't use this device (disable) in Device usage field in Properties window. Click Save button.
4. Test your Jabra headset by making a call in softphone.