CUCM 6 does not support auto-attendant functionality itself.
Complementary products including Unity, Unity Connection and Contact Center Express can provide this but require a separate server and licenses.
You may have a five seat license for Contact Center Express already as Cisco have a promo that supplies these with CUCM but you would still need to buy a server (e.g. 7816 $4,000) and Windows OS ($2,995) to deploy it.
Windows based versions of CCM allowed you to install the contact center software co-resident with CCM but this is no longer possible with Linux based CUCM systems.
