I have CUCM version 7.0(2) which is upgrade from version 3.3(5) , all things working fine except the following points:
1- there is a delay in making transfer on the most of the IP phones over LAN .
for example I dialed from my mobile to the operator and the oprator made transfer for the call .
she said it take time more than the time on the old system (CCM 3.3).
2- to search on the Corporate Directory it takes one second to access the search ,it is common on the old phones 7912, 7940 and 7960 .
so If any one have a solution for the two questions,it will be fine.