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Collaboration, Voice & AV · Advanced

Certificate Authority Proxy Function (CAPF)

A CUCM service that issues, upgrades and deletes Locally Significant Certificates on Cisco IP phones.

Definition

CAPF can act as the CA itself or proxy requests to an external CA. Phones authenticate to CAPF using an existing certificate (MIC or LSC), an authentication string entered on the phone or a null string. Phones then use the LSC for TLS connections in authenticated or encrypted security modes.

Example

An admin sets the CAPF operation to Install/Upgrade with authentication by existing certificate (MIC) for 500 phones.

Exam tip

LSCs come from CAPF; MICs come from the factory. Cisco recommends LSCs for TLS.

Related terms