Not that i know of, but if you disable your swipe lock, you'll always be presented with soft buttons on the screen to answer calls. I hate the swipe lock anyway, so this works fine for me (i just use a passcode lock on my x)
I hate that swipe to unlock, but i thought if my phone is in my pocket and i receive a call, there is a good possibility the answer or reject button get pressed without my knowledge. Just food for thought