Step 1:
Using the SPA, press the Setup 
button..
Step 2:
Go to Network (9) using the Navigation 
button.
Step 3:
When the Network section appears, go to DHCP Enable (1).
Select Edit soft key.
Set it to No by pressing y/n soft key.
Press Ok soft key.
Step 4:
Go to Non-DHCP IP Address using the Navigation button.
Press Edit soft key.
You have to enter the IP address of the SPA then press OK soft key.
Note: For example, if the IP address of the SPA is 192.168.1.100, you have to enter 192*168*1*100. Asterisk key will be the period.
Step 5:
Go to Non-DHCP Subnet Mask (9).
Press Edit soft key. You have to enter the subnet mask of the SPA then press OK soft key.
Note: If the subnet mask of the SPA is 255.255.255.0, you have to enter 255*255*255*0.
Step 6:
Go to Non-DHCP Default Route.
Press Edit soft key.
You have to enter the default gateway of the SPA then press OK soft key.
Note: If the default gateway of the SPA is 192.168.1.1, you have to enter 192*168*1*1.
Step 7:
Go to Non-DHCP DNS1 (12).
Press Edit soft key.
You have to enter the DNS1 of the SPA, press OK soft key
Press Save soft key.
Note: If the DNS1 of the SPA is 192.168.1.1, you have to enter 192*168*1*1 using the number keypad.