What is a capability of Cisco Expressway?

Cisco Expressway is specifically designed to provide secure remote access to internal Cisco Unified Communications Manager (CUCM) and Cisco Unity Connection services for users located outside the corporate network, without the need for a VPN. It acts as a gateway for mobile and remote access, enabling features like voice, video, presence, and instant messaging.

Remote endpoint enrollment with Certificate Authority Proxy Function (CAPF) is a function typically handled by CUCM in conjunction with a Certificate Authority, not a primary capability of Cisco Expressway itself.

An analog telephony adapter (ATA) converts analog phone signals to IP packets and vice-versa, which is a completely different function from Cisco Expressway's secure remote access capabilities.

While Expressway facilitates remote user access, directory access is fundamentally provided by the underlying Cisco UC infrastructure integrated with enterprise directories, not a unique capability of Expressway.