Thanks @hecatae - I will give that a try.
Thanks @wardmundy - it would appear that the base is built. Now to work out what a PIAF5 build (not on a Pi) gives me that a base SBC/Pi build does not.
But I am going on a couple of cruises in a few months (Singapore-Phuket-Perth, then Sydney-NZ-Sydney) and want to take it with me. (Or were you running from Cloudatcostfor that...)
@MisterQ there is this https://www.3cx.com/docs/3cx-tunnel-session-border-controller/
Whether or not it's what you are looking for....
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