Need Help : Routing 2 different LANs to 2 different internet providers

Hello evrybody,

i have juniper SSG20 , 

i want that the lan of VoIP uses an interface for lan who routes to a wan interface and the Data lan interface touted to another interface.

for exemple :

Ethernet 0/0 = internet : 55.55.55.54

Ethernet 0/1 = internet ip : 55.55.55.55

Ethernet 0/2 = voip lan : 10.0.0.1

Ethernet 0/3 = data lan : 192.168.1.1

and what i want to do is to route  the outgoing traffic of ethernet 0/2 to ethernet 0/0 and ethernet0/3 to ethernet0/1.

the current configuration is using only one untrust interface but that makes problems for the voice quality.

i wish that i well explained my problem , 

Thank you !