Skype already has the ability to set a custom ringtone that is stored on the phone for someone. Lets take it one step farther and add the ability to make the default ringtone, for all contacts, one that is stored on the phone.
So you dont know how to do it?
This is really annoying of MSFT not able to provide such a basic thing.
Looks like they want to let everyone know that we are using their product by keeping the same ringtone...