Suppose for your convenient purpose you’re using iPad or Mac instead of attending the calls on iPhone and you want to turn off irritating Phone calls default ringtones on iPad or Mac follow this article which provides you the clear information.
Initially we will start with Mac, First of all you have to open the face time from the application folder or dock if you have got the icon there, now you have to hit the command comma or go to the face time menu and choose preferences. There you have to uncheck the iPhone contacts calls check box and quit the face time because from now you will stop hearing the irritating default ringtone on your Mac. If your phone is near by you and on Wi-Fi, like Apple says it needs to be to make this feature work.
If you want to do the same thing on your iPad then tap into your settings applications and find the face time preference pane. Just by tapping the iPhone calls to turn off and from then you no need to think about the coming calls to your iPad. Even you can turn off in iPhone too by following the similar steps.