I brought in a system in house and trained myself as well as continued to apply special client applications to Partner, Nortel, Toshiba as well while in the field.
Probably will do the same. I like real time experience instead of class room experience myself.
One big questions, does OIP offer flash hook Centrex transfer for a users mail box like Nortel does.
For example MB user says I am away leave a message or press "X" and you will be transferred to my cell phone.