phone issue,Pls support

Alright, I am sort of a noob but I am excited to get Asterisk up and running for my home office. I seem to have ran into a couple of holes that I can't climb out of...

I have an SPA941 phone with 2 line appearances. Even though I have configured the lines as separate extensions in the web interface, regardless of which one rings line one lights up. Is this normal? Also, is there a way to make this like the good old analog pbx phone so when can select a line the call goes out the corresponding line number.

I'm also fighting with an Zyxel P2000W WiFi Phone that I am trying to setup to use remotely. I can get the phone to register locally but when I take it elsewhere I cannot get it to register even when I set the asterisk box and the phone to be the dmz.