/mcpDescription Setting For this setting that is used for CAPF, choose the key size for the certificate from the drop-down list. The default setting equals 1024. The other option for key size is 512. If you choose a higher key size than the default setting, the phones take longer to generate the entropy that is required to generate the keys. Key generation, which is set at low priority, allows the phone to function while the action occurs. Depending on the phone model, you may notice that key generation takes up to 30 or more minutes to complete. Note The CAPF settings that are configured in the Phone Security Profile window interact with the CAPF parameters that are configured in the Phone Configuration window. Key Size This setting applies to phones that are running SIP that uses UDP transport. Enter the port number for Cisco Unified IP Phone (SIP only) that use UDP to listen for SIP messages from Unified Communications Manager. The default setting equals 5060. Phones that use TCP or TLS ignore this setting. SIP Phone Port Phone Security Configuration Task Flow Perform the following tasks to configure phone security: Procedure Purpose Command or Action Search for the phone security profile to secure a phone. (Optional) Find Phone Security Profile, on page 149 Step 1 Set up the phone security profile to secure a phone. Set up Phone Security Profile Step 2 Apply the phone security profile to secure a phone. Apply Phone Security Profile Step 3 Synchronize all the phone security profiles with selected phones. Synchronize Phone Security Profile with Phones Step 4 Delete all the phone security profiles associated to a phone. (Optional) Delete Phone Security Profile Step 5 Find all phones associated with phone security profiles. Find Phones with Phone Security Profiles Step 6 SIP trunk security profile interations and restrictions SIP Trunk Security Profile Interactions and Restrictions Step 7 Find Phone Security Profile To find a phone security profile, perform the following procedure: Security Guide for Cisco Unified Communications Manager, Release 15 and SUs 149 Basic System Security Phone Security Configuration Task Flow