best response confirmed by ThereseSolimeno (Microsoft)
Solution

@ThereseSolimeno @DwightShrute 

 

'Analog' devices are perhaps poorly named, what they mean is they are not network devices, they don't connect using tcp/ip and you cant plug them into a switch, router or anything else. They need a simple wire connecting them to a phone line.

 

Some specific sbc provide these analog ports that you can then wire them straight to your device (maybe through a patch panel, but ultimately its one continuous electrical connection.

 

So yes, if you want to connect analog devices you'll need an sbc on premises you can wire them upto.

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