Cisco Mobile and Remote Access MRA with Cisco Expressway 

Cisco Mobile and Remote Access (MRA) with Cisco Expressway
Cisco Expressway is designed specifically for comprehensive collaboration services provided through Cisco Unified Communications Manager. It features established firewall-traversal technology and helps redefine traditional enterprise collaboration boundaries, supporting Cisco’s vision of any-to-any collaboration.
The primary purpose of the Expressway is to provide secure firewall traversal and session-based access to Cisco Unified Communications Manager for remote workers, without the need for a separate VPN client.
The Expressway is deployed as a pair: an Expressway-C with a trunk and line-side connection to Unified CM, and an Expressway-E deployed in the DMZ and configured with a traversal zone to an Expressway-C.
This video is a over the shoulders look at configuring the Expressway C & E to allow for MRA Access