Below was a comment from a manager moving from Nortel Option 61c to Cisco CallManager 5.1.2, I'm don't think the "live keypad" is a feature in CallManager, if you enter a extension of another user you must press the dial button when done.
"One major loss from a user standpoint has been that the keypad is not live. In the Nortel system you could enter another phone extension 5846 and it would just dial without any additional effort, therefore calling my extension. Each user has one extra step for every call they make by pressing Dial softkey in Cisco. I am surprised that Cisco can not program the same defaults." -customer