I've got our in-house SV9100 running with a dozen IP phones on our LAN, everything been working great for a few weeks. Now I'm trying to add a remote IP phone and am having all kinds of trouble.

I've narrowed it down to when I assign our routers WAN IP (public IP) to 10-12-07 'NAPT Router IP Address' for some reason this causes the inside phones on the LAN to loose connection with the 9100. If I set 10-12-07 back to default 0.0.0.0 the phones reconnect and all's well.

Why does this affect the phones on the LAN?