No - on any BCM below release 4.0, you buy Call Center as a package. If you want basic call center, that gives you two skillsets and 10 active agents. You can add more active agents if you need to have more than 10 people logged in at once. Reporting is a separate piece for basic call center, but is included with professional.
It's fairly straightforward to set up. Just make sure your CDN is a B1 DN and not a B2 DN. Load any voicemail patches that came out after CP3.
Now, if your BCM is at release 4.0, you need to buy Call Center stuff separately. You buy the call center keycode itself, then the keycode for the number of skillsets you need, then the correct number of agents, and to top it off, reporting. But for you, just buy basic call center and you're good to go.