I assume your number 2 is the thread I started.
As N7AS suggested, setup an OBi GW with the Simon Telephonics credentials.
Change the sp2 X_InboundCallRoute to {(robert)>(xxxxxxxxxx):vg1},{ph}
All 10 digit numbers entered on the ATA will be forwarded to the OBi's VG1.
For more flexibility use:
{(robert)>(xxxxxxxxxx):sp1},{(robert)>(<9:>xxxxxxxxxx):vg1},{ph}
All 10 digit numbers entered on the ATA will be forwarded to the OBi's sp1
10 digit numbers with a prefix "9" will be forwarded to the OBi's VG1
The call route will strip off the "9".
It looks like Simon is back in business here:
https://simonics.com/gvgw/