Not sure if I follow your first question, are you looking for the part number? Vg224 works with CUCM and CME.
For your second question, the answer is that qauad T1 cards come out some time ago.
Thank you for the link. There is a lower price for the Multipack part number versus the individual part number but there are rules around it. I think you have to purchase 4 and any after that you can use the MP/4 Pack part number but not sure.