As with all Lync Server roles, the Topology Builder must be updated to include Persistent Chat before the server role is installed. Follow these steps to update the Lync topology to include Persistent Chat:
1. Log on to a system where the Lync Server 2013 administrative tools are installed using an account that is a member of the
Domain Admins and
CsAdministrator groups, and open the Lync Server Topology Builder.
2. At the prompt, select Download Topology from Existing Deployment to retrieve the current topology from the Central Management Store.
3. At the Save Topology As prompt, select a name and location for the Topology Builder file and click Save.
4. In the left pane, expand the Lync site where Persistent Chat will be installed, ...