It can be done either with t1 or pri, with analog networking, it is described in the documentation under analog networking, that part is free. Should you decide that you want network voicemail then I suggest reference the tsb on Mitel OnLine if your a registered user titled Centralized vcicemail it is also described in the technical documentation. Centralized voicemail can be done with either t1 trunks, pri or ip trunks, centralized voicemail is a purchasable option in form 04. IP trunks does not require that option, have fun.
