[FSA III]

I'm not sure if this could be your problem but my brother has an issue with the ringtones he uses. He explained to me that certain ringtones I sen him he can not use because of their format. He says the ringtone works but when he answers the call using his bluetooth, the bluetooth mutes. He bought a new bluetooth (Jawbone) but still has the problem. It's his phone he says. Try a different ringtone or ringtone format (eg WMA, MP3d,ect).