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:

■

Cisco Unified Communications Manager 11.0(1) or later

■

Cisco Jabber 11.1 or later

You can read more about how this feature works in the Mobile and Remote Access through Expressway Deployment
Guide on the

Expressway Configuration Guides page

Lync Screen Sharing Through a Gateway Cluster

Transcoding of Lync screen sharing was introduced in X8.6.

X8.7 extends this feature to work on a cluster of Gateway Expressway peers, so that a greater number of screen
sharing sessions can be simultaneously transcoded.

You must configure the Lync B2BUA and the related transcoding parameters on the master peer. The number of
transcoding sessions you enter is the per peer number.

The transcoding capacity of the cluster is approximately the number of sessions you choose multiplied by the number
of peers, up to a maximum multiple of 4x.

Cisco Expressway Administrator Guide