Hi all, I have a remote office with poor wireless WAN connectivity. I want to move that office to a VoIP system via Cisco Spark but I'm wary about reliability. I'm hoping to use a USB 4G modem as a backup so that office can still use their phones, but because the main connection is so shady, I don't want regular internet traffic consuming our allotted data unnecessarily.
Is there a way to restrict the MX64W to Spark traffic only when it has failed over to the 4G modem? I haven't done any research on Spark's firewall requirements but I don't see any per-connection restriction rules aside from global traffic shaping.
That should work and keep things simple for fail-over etc. However if you want to get a little fancier, you could just some custom performance classes for voice specific and let the SD-WAN feature determine which path is best for voice etc.