Each tenant can have a designated night-service station. When a night attendant is unavailable, the system directs calls to an attendant group that is in night service, to the night-service station of the appropriate tenant. When someone places an attendant group into night service, all trunk groups and hunt groups that belong to tenants that the attendant group serves, go into night service. In this case, the system routes incoming calls to the night-service destination of the appropriate tenant. Each tenant can have exclusive access to the following entities: