UTG+1 is 21/17 and pretty solid, button is a 41/28 fish.

Full Tilt No-Limit Hold'em, $800.00 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

UTG ($21681)
UTG+1 ($57885)
MP1 ($10442)
MP2 ($32465)
MP3 ($13346)
CO ($26699)
Button ($26658)
SB ($14378)
Hero (BB) ($12495)

Preflop: Hero is BB with ,
1 fold, UTG+1 bets $2000, 4 folds, Button calls $2000, 1 fold, Hero???

Call or shove?

fold pre given utg has opened, if it was like co open btn calls then ship ship

Getting nearly 4-to-1 it's hard to fold, I would prefer being able to smooth call in this situation, but thats not a very good option with only a 12k stack. KNowing that the original raiser is solid I also think that folding is the best option. A shove will only be called by a better hand and a coinflip is your best case scenario. On the other hand if you call and flop something (like top pair), but not a monster you may be shoving on the flop and once again you will mostly get called by a hand that dominates you.