Hello,
I'm not aware of Call History or Speed Calling (Speed Dial) being features of the Mitel 5540 IP Console. Call History is only support on 5000-series IP Phones and on the 5550 IP Console (PC-based console). Speed Calls can be programmed system-wide via the Speed Call form on the Mitel MiVoice Business (MCD) or Abbreviated Dial form of the SX-200 ICP (depending on which system you have).
As for the last question, we would need to know which system you have (MCD or SX-200 ICP) and where the calls are going now (and how). Calls can be redirected a number of different ways - all depending on the system type.