Here is the setup: I have a Balance 20x in a small medical practice. I have a business circuit as my WAN ISP, its bridged, as I can see and manage it via IC2. I share rackspace w/ an IP phone vendor who has a dedicated circuit for his phone system. We wants to be able to use my router as a failover for his system. I created a VLAN for him, and it works well in this role. However it is problematic for him as he receives a private DCHP address over the VLAN, he wants to have a static IP so he can remotely access his gear during failover. Right now - he can’t manage his gear when he’s failed over to my network. I think we used to do this with DDNS to get behind the firewall right? How would you try to accommodate this? Is it even doable?
You would need a routed subnet to do this, or you could do it through FusionHub with some slightly advanced configuration. Else, a second modem connected such as a MAX Adapter or 5G Adapter, and set outbound policy and passthrough (or 1:1 NAT).
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Hello @Steve_Rosenthal,
You could use selected Port forwarding/mapping to the IP phone vendor’s router, just make sure their router is always on the same NAT’d IP address (use DHCP reservation or assign a Static IP).
If your site’s IP address is static, you do not need a DDNS service.
Alternatively, as @ChristopherSpitler mentions, invite the IP phone provider to change their router to a Peplink and start using the InTouch features.
Happy to Help,
Marcus 
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Thanks Marcus & Christopher!
I’ve been advocating him to convert, but…as you know the expression ‘you can lead a horse to water…’
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