How to take Control of the Call Application

RWindowGroup *pWG = &CCoeEnv::Static()->RootWin();
pWG->SetOrdinalPosition(0, 2000);
CAknInformationNote* informationNote;
informationNote = new ( ELeave ) CAknInformationNote;
TBuf16<30>message;
message.ZeroTerminate();
message.Copy(_L("Calling"));
message.Append(aNumber);
informationNote->ExecuteLD(message);