I've got a 2820 IPPBX here, and trying to connect 2 linksys SPA 941 phones to it as extensions, have set up the phones to connect to the router, SIP trunk works fine, but the phones won't register, just say Failed on the linksys web interface. I can't telnet to any port on the router from the PC either. Any ideas? I've disabled the firewall on the router too.