Thanks, 出入自在，PAP2T is the replacement for SPA1001?

which has 2 FXS (don't know what it means though), and SPA2102 has 2 FXS, router, adapter from linksys. So, looks like PAP2T is good for me. What's the router of SPA2102 for, I don't need it, since I already has router. By the way, I used cable, so I should have static IP, right?