6.5 - Calling an all in with PP.

[DannyOcean_]

Full Tilt Poker Game #3449265755: $6 + $0.50 Sit & Go (Turbo) (26364763), Table 1 - 50/100 - No Limit Hold'em - 13:46:03 ET - 2007/09/03
Seat 1: SydParrot (4,360)
Seat 3: alice28 (1,640)
Seat 5: VAguy (3,685)
Seat 6: MsManilaPI (850)
Seat 7: XMadFishX (1,400)
Seat 8: MrDannyOcean (1,565)

SydParrot posts the small blind of 50
alice28 posts the big blind of 100

The button is in seat #8

*** HOLE CARDS ***
Dealt to MrDannyOcean <font color="red"> [9s 9c]</font>
VAguy folds
MsManilaPI raises to 850, and is all in
XMadFishX folds
MrDannyOcean...

Which pocket pairs do you call here with vs. an unknown? I felt like 99 was marginal. TT+ i call pretty easily, but how far down do you go after that?