Solid calling hands

I would seldom call off more than 20 % of my stack preflop with a hand that's not good enough to call an all-in with. If the raise was only 5-20 %, there are a few additional hands that I might call with. Keep in mind that it doesn't make sense to call with the hands that I mention here if there's a maniac that will often go all-in after you've called (unless you have a good enough hand to call that all-in).

10-20% of stack: I might call with AJ, AT, KQ, 77 and 66.
5-10% of stack: I'd probably call with any pocket pair
3-5% of stack: I'd probably call with suited connectors(98, 87, 32 and similar) and two-gappers (T8, 97, 42 and similar) and Ax suited.

I have to mention that the object of calling with small pocket pairs or suited connectors is to win a lot when you get a good flop. If most of the others players that have involved themselves (especially the player(s) that raised) are almost all-in themselves, it's not a good idea to call off much of your stack with those hands.