can someone help me to mute system tones during call???? EPIC 4G

[greenmuggy]

i jus want the system tones not to play when im on a call. i have music tones set for messaging tones & when im in a call it plays the sms ringtone full force over whoever im talking to's voice & i cant hear them till the ringtone stops. is there any way 2 fix this???