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This feature has no effect once ticked. I've found the solution suggested on this foruim for Z1 comp., re force restart but it doesn't work for me.
Solved! Go to Solution.
OMG! Fixed! Sony this is my statment to you as you have invented a bicycle here.
The only thing need to be done is just reduce main sound setting to the level you want ringign to start from. for me it was on MAX level initially and obviously ringing sarted from MAX 
Try repair with SUS in Sony Companion (reinstal KitKat).
If it occurs just to volume rocker on the side of the phone, and it works with touch screen dot with a finger it might be the volume key is broken or not connected, that will throw you for exchange or repair with sony service.
No result
Do you have "Increasing Ring" turned on in the Sound section of settings?
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Obviously yes. As i said in my first post the box is ticked.