Fix ring for incoming call.

src/audiobuffer.cpp

src/configurationpanel.ui

src/configurationpanel.ui.h

src/configurationpanelui.cpp

src/configurationpanelui.h

src/jpushbutton.cpp

src/jpushbutton.h

src/manager.h

src/mydisplay.cpp

src/mydisplay.h

src/numerickeypad.cpp

src/numerickeypad.h

src/phonebookui.cpp

src/phonebookui.h

src/point.cpp

src/qtGUImainwindow.cpp

src/qtGUImainwindow.h

src/sip.cpp

src/tonegenerator.cpp

src/tonegenerator.h