I had exact same issue and was told by Meraki support: "- This is an expected behavior for VOIP traffic since in order to fall back to WAN1 we would have to kill the flow. In the case of voice traffic, the only way to do that would be to remove the WAN2 connection or reboot the MX. - However, if you do not want to failover to WAN 2 for just VOIP traffic we can enable backend feature which will help you define failover rules so that only VOIP traffic will not failover to WAN2 and it will automatically create a flow once the WAN1 is back online." I love that they offer a "feature" where failover doesn't work for VOIP phones. Incredible! Im looking elsewhere for my new sites.
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