We use the 3CX Clients only. So the ringing comes from our default PC Speakers. Master Volume is usually set to 80-100%. Unfortunately the ringing can become really annoying at such a high sound level. Lowering the Master-Volume is not really an option here, since this would influence other audio playback too much. But, there is a way around this: Since the Windows Audio-Mixer allows to handle sound levels of running programs seperately, this should not be an issue, right? Yes and no! Of course it works, but for the 3CX Client it just won't retain the set volume. Original Post: https://www.3cx.com/community/threads/windows-audio-mixer-wont-retain-volume-settings-for-3cx.48893/ Please Add this for future releases.