Can i retrieve voice messages from outside my company, something the same way as we do with home answering machine .We have CME 4.0 and NM-CUE

i have in my network two 4006 backbone switches and multiple 3500 XL access switches , with each 3500 access switch connected by two fiber giga uplinks to the backbones. I have different eight vlans configured through my campus.i want to use only one...