What are two functions of Cisco Expressway in the Collaboration Edge?

Expressway-C provides encryption (or Mobile and Remote Access but not (or business-to-business communications.

The Expressway-C and Expressway-E pair can enable connectivity from the corporate network to the PSTN via a T1/E1 trunk.

The Expressway-C and Expressway-E pair can interconnect H.323-to-SIP calls for voice.

Expressway-E provides a VPN entry point for Cisco IP phones with a Cisco AnyConnect client using authentication based on certificates.

Expressway-E provides a perimeter network that separates the enterprise network from the Internet.