Dual Wan Setup (one for internet the other for VOIP)

Hey guys, just wondering if there’s anyway I can set this up. My customer currently has DSL (>1mb down,384k up) and the 2nd is going to be a Point to Point setup between their building and ours (about 10mb up/down). Is there anyway I can have all the internet go through Eth1(Wan1) and the VOIP to go through Eth2(Wan2)?

They have a RB450G if that helps out at all.

Thanks.