Sonicwall - Block network traffic for one device through one interface

Looking for an elegant solution.

Have VOIP PBX system on the LAN that connects to a SIP trunk provider. Have 2 ISP circuits and a basic Fail Over - one circuit is DSL. When the primary circuit goes down, fails over to the DSL. I want to block traffic from the VOIP PBX through the DSL circuit because it's too slow (The PBX will actually failover to its POTS lines if it can't reach the internet, which is what I want)

Access rules don't work because they are zone based and the PBX is in the LAN zone.

Was advised to specify the outbound interface in the NAT policy to the interface of the primary circuit, but this didn't seem to work because there's a default policy that kicks in for Any outbound interface.
Kara ThraceAsked:
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Here is an existing EE solution that would do just want you want (bear in mind that with Sonicwalls, you have to use the IP to spell out a particular device):

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Benjamin MOREAUProject ManagerCommented:

You can create a Routing rule to force IPX to use you first WAN. Routing rules take precedence over load balancing. So, i your loadbalancing switch to your backup WAN, VOIP flow will continue to be routed to your (down) first wan.

Configure a route only for your PBX server as source will not impact other network equipment
J SpoorTMECommented:
if you go to the LAN to WAN firewall rules, and add a rule, you can change the destination from WAN Zone, to a WAN interface, e.g. X1
Kara ThraceAuthor Commented:
Resolved the issue perfectly and elegantly. Thanks.
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