Conferencing Attendant Configuration is disabled until Conferencing Attendant services are installed
When you log on to the Office Communications Server --> Administrative Tools --> and then click Office Communications Server 2007 R2 --> right-click on the forest node --> Properties --> Conferencing Attendant Properties you get the following error message:
"Conferencing Attendant access nubmer and region configuration requires one or more Conferencing Attendant services to exist within the Office Communications Server forest. Configuration is disabled until Conferencing Attendant services are installed."
Office Communications Server (OCS) 2007 R2