Fully tested on android 7 and below.
Set desired minimum and maximum ring level and get gradually increasing ringer.
Volume restores pre-ring value after the call.

Features:
- simple mode
- start ringing from minimal level and increase volume periodically
- option to ring when phone in vibrate/silent mode
- return volume or pre-ring or to user set level
- limit minimum ringer volume
- limit maximum ringer volume
- vibrate and mute as increasing volume option
- led notification
- find my phone function (maximise volume after some number of calls from same number)

Source code is available at https://github.com/i-kozlov/IncomingCallSound


Please make sure no other app like audio profile schedules overrides your incoming call setting.

Contact me if you want help in app translation.

All old version https://yadi.sk/d/IqloMiEDiBujg
Beta test link is available in app group https://plus.google.com/communities/101627876127250211559