Meraki MX is not strong at site to site VPN - but it should work. Here is the setup guide. https://documentation.meraki.com/MX/Site-to-site_VPN/Site-to-site_VPN_Settings#Non-Meraki_VPN_peers You could also conisder getting the provider to move the circuit and their router to the new office, and only use the circuit for VoIP. You would add a route on your MX pointing to the VoIP providers router for their IP addresses. Alternatively you could consider changing your VoIP provider to one that has phones that can run directly over the Internet, which makes life so much easier. That is what we do.
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