I have setup the Zywall USG 50 (3.30(BDS.2)) to take advantage of 2 separate internet connections. I'm using the spillover method with active and passive setup. So far everything works perfectly. The Zywall does its job by sensing that the WAN1 connectivity has failed and activated WAN2. However, the VoIP phones will not work even when WAN2 connectivity gets activated. I performed some packet capture on the device itself and after analyzing the captured packets, for some odd reason, SIP registration requests are still trying to go out from the WAN1 interface, which happens to be dead. I have no idea as to why the router would try to forward packets when it knows that the port is deemed dead. Just to rule out that the VoIP phones aren't the culprit here, I reboot them manually and when they are initiating, they connect to the FTP server to obtain conf. files just fine. It's just the SIP registrations that are not being diverted to the working WAN interface. I have zero routing policy setup so that is not the case either.
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