About Certificate Authority Proxy Function
Certificate Authority Proxy Function (CAPF), which automatically installs with Cisco Unified Communications Manager, performs the following tasks, depending on your configuration:
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Authenticate via an existing Manufacturing Installed Certificate (MIC), Locally Significant Certificate (LSC), randomly generated authentication string, or optional less secure "null" authentication.
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Issues locally significant certificates to supported Cisco IP Phones.
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Upgrades existing locally significant certificates on the phones.
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Retrieves phone certificates for viewing and troubleshooting.
During installation, a certificate that is specific for CAPF gets generated. This CAPF certificate, which the Cisco CTL Client copies to all Cisco Unified Communications Manager servers in the cluster, uses the.0 extension.