I had the same setup with a couple of my customer's, They had three or four differnt company's, so each company ( extenison ) had two lines in a hunt group, so if they where on one line and got a call on the second line, check c.i. to see if you want to pick it up or let it go to v.m. ( had the v.m. pc card large, but you can do it on the small also ) or go the a.a. way as mike & hal said

Voice/Data & Cable Contractors, Avaya/Lucent, Nortel and Panasonic Serving Central Fl