For this post I am going to assume you have the phone plugged into your network and that something is giving out dhcp address. I'm also assuming you have already configured your extensions on the server and have the extension password to hand.
I have seen some talk of this phone being either a 2 line or 4 line version depending on the firmware. I don't know how to do that bit and for my install I only need 1 line so am not really fussed.
First job (just to be safe) is to reset the phone to factory defaults.
Press the menu button
Use the up/down arrows to select option 14 "Facroy Reset" and press select (or key in 14)
Confirm by pressing ok
The phone will then restart and get a dhcp address from the dhcp server.
Check the current IP
Press the menu button
use the up/down arrows to select option 9 "Network" and press select (or key in 9)
The phones current IP should be listed in item 2 on the screen. For my example it is 172.17.0.152
Enter the settings for your asterisk/Freepbx server
goto the phones ip address in your browser (I used chrome)
click on the admin login link from the top of the page
select regional tab
clear all "Vertical Service Activation Codes"
change timezone to GMT
select the Phone Tab
under line key 2, 3 and 4 change extension from 1 to disabled
select the Ext 1 tab
Enter the ip address of the asterisk server in the proxy box (172.17.0.20)
Under Subscriber information put;
the users name in display name
the extension number in user ID
The secret key from the asterisk extension config in the password box
(as long as this is the same on both ends it doesn't really matter what it is)
Click the Submit all changes button and wait for the phone to restart (which sometimes takes a while)
