Hi Bruce, Sorry for the delay. I find it odd that your PBX should stop working just because you've failed over to the other internet connection. I'm assuming that you issue is a SIP trunk that uses your internet connection and that your SIP trunk provider will only accept requests from the IP address on your primary link. Yes that's it ! Assuming its a SIP trunk issue - if you can reconfigure your SIP trunk to use TCP instead of UDP (assuming that your provider supports SIP with TCP, and that you're currently using UDP), that may solve it. This will mean that you move to a connection-based transport, rather than connection-less which may aid in the system 'realizing' it can't get a connection on the secondary WAN link. I am don't know how to do that , and i don't really know how work a SIP trunk. I am not a guy from Telephony side 😅 Ask Meraki Support to apply the Cellular Failover firewall rules on the MX to the WAN2 port (rather than the cellular modem). This will allow you to create a specific ruleset on WAN2 that specifically denies traffic between your PBX and the cloud service. Hopefully this will stop the issue you are seeing occurring as the traffic from the PBX won't be able to exit via WAN2. But it's not a Cellular connection, will it work ? Thank you !
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