Linksys SPA2102 - Manual (Page 39)

Phone Adapter with Router
31 Chapter 6: Using the Web-based Utility
The Router Tab
Host MAC Address. Enter the MAC address of the device whose IP address you want to specify.
Host IP Address. Enter the IP address you want to assign to the device, 192.168.0.x (x being a different number
for each device you specify).
When you have finished making changes, click the Submit All Changes button to save the changes, or click the
Undo All Changes button to undo your changes.