question about needed FXO card for Cisco 2821 CME

We have a Cisco 2821 router running callmanager express for our secondary location which just had an intergrated T1 installed which provides the T1 with 7 POTS lines broken out to a 66 block.  Will two 4 port FXO cards (VIC2-4FXO) be all I need to add the lines?  Or do I need this card (VIC-4FXS/DID)?

If anyone knows a better way to get the POTS lines to the 2821 please advise.
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Yes, you need the FXO cards, not the FXS


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