SMS Tones must be renamed to any of the following: sms-received1.caf sms-received2.caf sms-received3.caf sms-received4.caf sms-received5.caf sms-received6.caf and placed in /System/Library/Audio/UISounds. Let them replace the existing tones. You should back up existing tones first. Ringtones can be of any name as long as the format is .m4r Place them in /Library/Ringtones or sync with iTunes.