We rented a showroom that already has the 410 unit on the wall. I bought 3 refurb'ed phones, called the phone company and had 4 lines brought in. My question is this, does the 410 unit rollover the lines so if line 1 is busy the next call in on that number will go to line 2,3 or 4 or do I need to have the phone company set up my lines to roll over????, Everthing else works fine just. Any help out there?

Phone company does the rollover.