I have 2 different T1 lines coming into work now, with 2 different networks on them with internet service from 2 different providers. Is there a way I can link them together so when 1 goes down the other one steps in and picks up the slack? I need the addresses to be given out from a Cisco router, with IP Phones service build in. I really only want the other line connected as a back up or to take advantage of the added bandwidth. I have 2 servers as well.