sorry if im posting this up for s second time. i cant seem to find my post anywhere on the website.
my question is, is it possible to modify an sms ringtone to be silenced by pressing a button if the sms ringtone was a long one? i have a person who is willing to pay me to make this but im not sure if it can be done. this is what they want.

1. An sms arrives and the 25 second alert starts.

2. If a button isn't pressed, it keeps playing for 25 seconds.

3. If a button is pressed, the sms alert is silenced.

he wants it to act similar to a ringtone. when you receive a phone call when you press a button the ring is silenced but it is still ringing.

i was wondering if it was possible to program the iphone to do this?