Cisco Unity Express is a network module for the Cisco 2600XM, 2691, and 3700 Series access routers. This module expands the Cisco IP Communications portfolio by providing integrated, entry-level, voice mail and automated attendant services for the branch office. Operating under Cisco CallManager Express control, it offers a cost-effective voice mail solution for up to 100 users working in an enterprise small branch office or in a small business with one or more locations. The feature-rich, call processing capabilities of Cisco CallManager Express coupled with the voice mail capabilities of Cisco Unity Express provide a simple, intuitive IP Telephony experience for the user.