I don't see any point in running all traffic through the ISR when the only thing it is processing is PRI voice traffic.  I would plug it into the Meraki switch using a single Ethernet interface.   You could even put the ISR and all the phones into a separate voice VLAN. ... View more

I concur, connecting via copper to get cloud sync is definitely the best way to go (have the SFP+ modules in) so that the cloud sees them.  After that, it's a functionality that has to be turned on by the support team, you'll need to call them.  ... View more