This article is one in a series to assist in the setup, troubleshooting, and maintenance of Cisco Small Business products.
There are only two ways to determine the SPA400 IP address:
Using the SPA9000 Setup Wizard
After running the preliminary section of the SPA9000 Setup Wizard, you will be asked to configure the SPA9000. Make sure you set "Using ITSP and PSTN" in step 1 section. Upon reaching step 3, you will be asked to identify the SPA400 MAC Address. Upon selecting the MAC Address of the SPA400, the SPA400 IP will show the current IP address of the said device. Note the IP address so that you can access the SPA400 web- based configuration setup page.
Using the Main DHCP Server of the Network
Another way of getting the SPA400's IP address is through the DHCP Client's table. Through this option, it will generate all the devices being given with a dynamic IP address including the SPA400. Try to look at the MAC Address indicated at the bottom part of the SPA400. Look at the list of DCHP clients of the router and see if which among the list matches the MAC you and its corresponding IP address. This will be used now to get through the SPA400 web-based configuration page.
Accessing the SPA400's Web-Based Setup Page
After getting the IP address, you can use your browser and type the IP address of the SPA400. Under User Name enter "Admin" and leave the Password field blank ("Admin" is the default username of the SPA400). If you can't access the SPA400 page, turn off your personal firewalls and pop-up blockers.