With the Multiple Device Access (MDA) feature, users can register with multiple devices. In the past, the multiple devices usage with one extension number, may have resulted in a problem establishing the exact location of an emergency call. However, in Session Manager, the callers exact location can now be determined. This allows Session Manager to support the tracking of an emergency caller in large campus settings. The advanced communication applications guide the emergency crew to the exact location of the emergency call using LED display units near the main entrance of the site.