just more info here on what it takes to pull off a nice redundant error correcting tunnel with other products.
peplink is about the best and cheapest option.
Get a $400 (or much more) peplink router for ‘site’ side
Get another $400 (or much more) peplink for the ‘server’ side
Pay approximately $5/m/device (paid yearly) for required license support, so a PTP is going to be $10/month.
To do this in the cloud you have to do at least 5 tunnels on the cloud side for $500 up-front, plus those yearly license rates.
This gets expensive pretty quickly because it ends up being around $10/month with a heavy initial spend just for the tunnel and then whatever extra complications required to make the work with an application.
I would very very gladly pay zerotier a monthly pro license for this and MANY others would as well.
(hint, 3cx PBX and SBC both happily run zerotier so that’s a very very large and interested audience)