It took me about 5 minutes to setup and now I can make free calls to any US number from a standard handset connected to the SPA2102.
Details left to the reader but you do need
a US SIP provider (I use sipgate) A US Google Voice number and account (can get that using sipgate first to get a US number and a VPN to get over GV's checking)
I am surprised how easy it was to setup and the high WAF! SHe wanted to call a friend in NY today to check she was not affected by the floods and making the call was so easy.
System One: Popcorn Hour A200, PS3 SuperSlim, NPVR running on Sempron 3000 (XP), Sony BDP-S390 BD player, Logitech Revue, Pioneer AVR, Panasonic 60" 3D plasma
System Two: Popcorn Hour A200 , Oppo BDP-80 BluRay Player with hardware mode to be region free, Vivitek HD1080P 1080P DLP projector with 100" screen. Harman Kardon HK AVR 254 7.1 receiver, Toshiba HD-A2 HD-DVD player, Roku XS media player