Linksys Wired Router :: RV016 Load Balance Configuration?

We have :DSLT-1  I want to route all VOIP traffic and traffic to one IP address over the T-1, all other traffic I want to route over the DSL.  HOWEVER, in the event that the DSL fails, have the DSL traffic failover to the T-1.I have setup the router to do just that (I think) and when I go to a site like "whatismyipaddress.com", it shows my IP as comming from the T-1.  With the setup I described that traffic should always route over the DSL.Straight up protocol binding won't work because the traffic I want to route over the T-1 to one specific IP is going to be prot 80 and 443 (web traffic)