| > No, not "or whatever" but "AND whatever".
| Do you mean "plug THEM in to your phone line and whatever"?
Yes, that is certainly one possibility. I imagine the "inside"
interface would be some easy-to-wire LAN interface, enabling THEM
to communicate using whatever protocol/address seems appropriate inside.
I wonder how to decide the trade-off between the additional hardware
complexity of a multi-outside-port box and the additional software
involved in sharing state across several single-outside-port boxes.