If you have a VIC-2FXS you'll need to put it in an NM-1V or NM-2V (or any of the newer more complex ones, but these are the basic ones), and with the right IOS load, you'll be able to run a phone off the VIC-2FXS card.
And you'd need a VIC-2FXO card to do that. Again, it'd have to go into a NM-1V or NM-2V card to insert into the 2600. Obviously, if you wanted to do both inbound and outbond in the same box, you'll want the NM-2V so you can stick both the VIC-2FXS and VIC-2FXO cards in, and you can have two calls in and two calls out to phones.
Usually, the SIP infrastructure is a bit more involved than that, but the cisco docs have some pretty wide range of configuration options that could degernate into your test case.
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