After looking and inform long I decided to choose the Jabra GN 9120 headset to my Gigaset C385. The headset could easily be registered as an additional handset and if you "internal meetings" allows, it even works to choose the handset and to transfer the call to the headset. The voice and sound quality leave nothing to be desired and also my interlocutors have to confirm that even with them the acoustics are perfect. So I now have the phone hands free, the annoying pinching the listener and I can no longer move freely around the apartment. The long search was worth it and I would recommend the device for frequent callers only further!