In a new Feature of the Day, Inside Microsoft Dynamics GP looks at new Unified Communications Functionality in Extender.
Microsoft Dynamics GP 2010 R2 Feature of the Day: Add Unified Communications Functionality in Extender
Tips & Hidden FeaturesDevelopment & IntegrationGP 2010
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.