Also ask around and get some recommendations on what VAR to use or not to use. Your Cisco sales rep should be able to give you names of competing VARs as well as customer contacts to check with. A Cisco Call Manager is not your father's phone system - nothing at all like a square key system, not by any stretch of your imagination. You're stepping out of a rowboat into a yacht. As you will learn, the administrative programming tasks for what may have been a very simple task on the Norstar will boggle your mind when you see how granularly complex the process is on the Call Manager.
What are you planning to do for voice mail?
Are you going to be directory-synched with Active Directory/LDAP?
Since I see you're buying CUWL licenses, does that mean you're also going to be doing CUPC & Presence?
Has anyone done a network site survey? (if not, why not?) Have you (or will you be) replacing your network switches with POE switches? Does your data network utilize Cisco hardware (routers & switches)? - Most competing hardware is fine, but opens the door for finger-pointing if it's not all Cisco and any problems crop up. If moving up to POE switches, beware that the AC load requirements are considerably higher.
Be awware too that all of Cisco's greyscale/non-backlit phones only have a 10/100 layer-2 switch in them. If you have gig switches and need gigabit to the desktop, you'll need color phones (7945/7965/7975). The "G" on the 7942G phones does not mean gigabit. (we got bit on that)
If after it's in and running you hope to be able to handle the administration of it 'in-house' you will need a minimum of two and possibly as many as 5 training courses just to get exposed to everything you'll need. How much you retain from the classes will in part depend on how much of what you learn you are able to put to use upon your return. Quite a few of the legacy telecom terms have also been changed, for example ARD/PLAR is called hotdial.
Original MUG/NAMU Charter Member