How to adjust incoming call ring volume in real time?

Dear all,

I'd like to write an AP which will change a pda phone's ringing volume while someone call you. It's not while talking, it's before you pick up the call.

I need to change it when it's still ringing. But I don't know which API or registry can I use to change it. I search on internet a lot but seems no one need to implement this kind of function.
If anyone know, please help me. Thanks a lot.


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