Yeah sorry about that dude, it's something of a tradition to fuck with the noobs a bit around these parts. Let me try again.
Obviously one person can't whistle a DTMF tone (DUAL tone, meaning two at once), you need a friend to help you. For this you'll need a special PDXUSA phone with two microphones on one circuit (or you can make your own, we call this a buttset) or else you can just stand really close, but this makes you look like you're making out (we call this a meatphone).