Your mobile workers need the same high quality, security and reliability that they experience when placing calls in the
office. You can assure them of just that when you enable the Dial via Office-Reverse (DVO-R) feature and they are
using Cisco Jabber on a dual-mode mobile device. DVO-R routes Cisco Jabber calls through the enterprise
automatically.

DVO-R handles call signaling and voice media separately. All call signaling, including the signaling for Mobile and
Remote Access on Expressway, traverses the IP connection between the client and Cisco Unified Communications
Manager. Voice media traverses the cellular interface and hairpins at the enterprise Public Switched Telephone
Network (PSTN) gateway.

Moving audio to the cellular interface ensures high-quality calls and securely maintained audio even when the IP
connection is lost.

You can configure DVO-R so that, when a user makes a call, the return call from Cisco Unified Communications
Manager goes to either:

■

The user’s Mobile Identity (mobile number).

■

An Alternate Number for the user (such as a hotel room).

This feature is dependent on the following versions of related systems:

353

Cisco Expressway Administrator Guide

Reference Material