Pausing the Music to take a call

If you've got your headset(earbuds) on and you're listening to music and a phone call comes in, you can pause the song and jump over to take the call all in one click (that's right - it's a click, not a tap). There's little button attached to the headset (about 5" form right earbud itself, it doesn't look like a button, it looks like a thin little plastic rectangle). Click the button, and the song playing is paused, and it answers your call. When you're done with the call, click the button again to hang up and pick up the song right where you left off.