Cisco 3620 router

[latintrpt]

Hey guys,

I'm a little new to routers but I have a an off site router that has 1 serial network interface card that is connected to my coporate router.  I'm looking to add an additional T1 to the off site router.  What kind of card am I going to need?

Thanks

[vmiller]

can you do a show hard and see what might be out there.

that router is long past end of sale.....