215r ISO spot against big stack BB

[Ditch Digger]

PartyPoker $200 Regular Tournament, Big Blind is t200 (7 handed) Converter on pregopoker.com

UTG (t2386)
UTG+1 (t1700)
MP1 (t200)
CO (t2427)
Button (t3032)
Hero (t2760)
BB (t7495)

Preflop: Hero is in SB with A[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]
<font color="gray">UTG folds</font>, <font color="gray">UTG+1 folds</font>, MP1 is All-in(200) , <font color="gray">CO folds</font>, <font color="gray">Button folds</font> Hero ?

BB has been fairly active but hasn't really shown down any stinkers. He's be very aggro post flop. It's a clear shove without shorty involved but since we aren't getting a free showdown I was lost on what to do. Calling seems extremely weak, raising is asking for a reshove by the BB, and shoving seems like overkill.