OK, so both setPlayLevel() and getPlayLevel() do absolutely nothing.
I took a look at the core code file submodules/linphone/java/impl/org/linphone/core/LinphoneCoreImpl.java
only to find these placeholder function that do nothing and return nothing useful.
public int getPlayLevel() {
// TODO Auto-generated method stub
return 0;
}
public void setPlayLevel(int level) {
// TODO Auto-generated method stub
}
linphone team should update their api documentation and say these functions are deprecated