I'm using an iPhone 5 trying to Facetime another person using an iPhone 4s. The issue is when I try to call them using Facetime, the "beeping" Facetime outgoing ringer sound is very very low. I have all my sounds put up to the max but for some reason the Facetime "beeping" ringer is barely audiable? I can hear it but I have to put the speaker up to my ear to do so. How can I fix this?