Anyway, I grabbed a couple of numbers, went to a public wifi, Lismore Square, and I used the numbers without VPN. I could call my mobile, I could call home as I checked the last called number on the Cisco 122, I could call my wife on her "home" voip number from my mobile and from my "home" voip number. The only thing I fond that was a problem was she could not call my mobile number. I'll have to try that again.
Now you may ask why, good question. For fun, to see how things work, to see what value it can provide as calls to the same ISP are free. I can call my wife and tell her I need another beer, that's got to be a plus, unless she leaves he phone behind but she likes her music too much for that.
I tried call farwarding with the SPA122, no, doesn't work.

I might have to contact the ISP and whine like Stiffy.