I have a NEAX 2000 IVS, for most of the users the MWI works fine but for others it doesn't. We use *9 to set and #9 to cancel. If we dial an extension to that works it says set, others when we try it just says RST. We doubled checked the extension compared to the others and they are all the same. We even moved the cards to the first PIM which is where all other ones are.