Beep is playing on incoming call, regardless of ringtone
When receiving incoming call on Android client, there is a soft beep playing on intervals, similar to what the caller hears when placing a call on a regular telephone. It plays even if ringtone is set to silent in account/media settings. Or if a ringtone is indeed set, this beep will combine with the real ringtone. I see no reason for this beep to be present. Not sure if it's the daemon or the client that generates this sound.