People at my school always ask me about voicemail, which we don't have. We have a nortel meridian opt 11 that runs in 2 cabinets. One cabinet with cards is a IPE shelf. The older cabinet runs the "Q" style cards and handles older SL1 phones and some analog. The tech from Verizon said we could add a "call pilot" system. How hard is it to add voicemail? Would this be something we could just plug in and configure or is it more complex than that?