voice lab setup help

i want to learn some cisco telephony, im thinking of buying
cisco service router 2801
i've seen the following mentioned but not quite sure what they are used for,
vic2-4fxo
vic2-2fxs
also, do i need a switch with poe ? i already have 2 cisco voip phones that i can use.
thanks
dave
cisco service router 2801
i've seen the following mentioned but not quite sure what they are used for,
vic2-4fxo
vic2-2fxs
also, do i need a switch with poe ? i already have 2 cisco voip phones that i can use.
thanks
dave
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