If it is a stand alone system you will need intergration sets set up to ancer the calles and send message waiting signal but they are set up like a normal 2008 set rolling over to one an other and they have a data modual that goes on the botton of the phone that intergrates to the voice mail system. But you might want to check to see if the rolm vmail is compable running with nortel cause it would need ome kind of nortel setings in there to get the timmers right. Good Luck
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