Network and Firewall configuration for LAN/WAN1/WAN2 traffic redirection

stefanop67 used Ask the Experts™
I need to configure a firewall (ZyXEL ZyWALL USG 100) to permit traffic split between two connections for Internet.
In one connection I should direct traffic to a server farm that contains business applications, this WAN has a private netowork address with 10.x.x.x/ range, always on this connection is redirect VoIP traffic, which is not controlled by firewall, and emails business ( POP3 and SMTP).
On the other line the entire web browsing.

What might be the optimal configuration?
I would also like to make it possible to handle two lines in backup mode one to another.

I attach a pdf file with the design of network infrastructure.
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See if source based routing is avalible in the mentioned firewall. If present route ur traffic from 10.x.x.x/24 to the specific router (router a) and all other traffic should go via the default route (poined to other router, router b)

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