To change initial ringtone to loud instead of soft, go to the following registry
HKEY_CURRENT_USER/CONTROLPANEL/SOUNDCATAGORIES/INCALL
Change INITVOL from 2 to 4 and soft reset the phone.
Alternative solution:
Go to HKCU\ControlPanel\SoundCategories\Ring\AttenuationCategory and change the value to 1 and you are all fixed. No more annoying increasing ringtone. Set it loud and have it loud, set it low and keep it low
There are 3 values that the AttenuationCategory can be set for.
0 is no ringtone volume
1 is flat ringtone volume
2 is increasing ringtone volume
REMEMBER TO WAIT 30SECS THEN SOFT RESET.
Note that these 2 methods doesnt work for all handset... still trying to explore the reason behind it...