if you want all the phones to ring at the same time, set up a calling group. send the calls from the aa to the calling group number. calling group one= ext 71
cg2=x72
cg3=x73
cg4=x74
this is the same type of group you set up for paging through the phones. not the type you use for the vm ports. with partner mail, you could set up a vm box for the mb matching the calling group number, 71, 72, 73, or 74. you could set up the mb as transfer only, no recording ability. in the aa, i would use a selector code to transfer to the group, but the calling group number should work just fine as well.
if you need more help, post back.