> do i need to encode it in a certan way before putting it to a http server?

do u mean, you just placed the edited configuration (text file) on the http server? no, you need to install the Configuration Tool program. the program needs the ff parameters:
1. MAC address
2. template text file

it should produce a binary cfgxxxxxxxxxxxx file. this is the one u must place in your server.

btw, i'm not familiar w/ DHCP Option 43. so, i use the keypad to point the IP phone to the config server. :-)