Hi, Have a customer that wants 30 TDM phones and 12 lines, with aa/vm, 4 ata ports, and a 4 trunk VOIP gateway to network to other BCM sites they have, as well as remote programming. Not sure if the BCM 50 will fit the bill or should go to 100/400. I like the fact 50 is on new OS instead of NT 4.0. Any suggestions? Time frame of OS change on 100/400