Customizing Cisco SPA and Wireless IP Phones
Enabling Call Features
Cisco Small Business SPA 300 Series, SPA 500 Series, and WIP310 IP Phone Administration Guide 44
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STEP  4 Under Linksys Key System Parameters, configure the following fields:
• Linksys Key System—Enables or disables the Linksys Key System for use 
with the Cisco SPA 9000. Defaults to yes. See the 
Cisco SPA 9000 System 
Administration Guide
 for more details.
• Multicast Address—Used by the Cisco SPA 9000 to communicate with 
Cisco IP phones. Defaults to 224.168.168.168:6061. (For the Cisco SPA 
501G, can be configured using the IVR. See the “Using IVR on the Cisco 
SPA 301 and Cisco SPA 501G IP Phone” section on page 19.)
• Key System Auto Discovery—Enables or disables auto discovery of the call 
control server (for example, the Cisco SPA 9000). Disable this feature for 
teleworkers or other scenarios where multicast does not work.
• Key System IP Address—IP address of the call control server IP. Enter the IP 
address for teleworkers or other scenarios where multicast does not work.
• Force LAN Codec—Used with the Cisco SPA 9000. Choices are none, 
G.711u, or G.711a. Defaults to none.
STEP  5 Click Submit All Changes.
Enabling Call Features
This section describes how to enable and disable call features on the phone.
Enabling Anonymous Call and Caller ID Blocking Services
STEP 1 Log in to the configuration utility. 
STEP  2 Click Admin Login and advanced.
STEP  3 Click the Phone tab. 
STEP  4 Under Supplementary Services, under the type of call blocking to enable, choose 
yes.
• Block ANC Serv—Blocks anonymous calls.
• Block CID Serv—Blocks outbound caller ID.