The Wireless Service Gateway (WSG) is an optional web-based appliance used for device management, messaging and alarm handling. The OpenStage WL3 telephones needs a basic parameter setup with the PDM, which are basic WLAN and IP settings, to be able to communicate with the WSG. Thereafter the WSG can be used to remotely and wirelessly edit parameters and update software of the OpenStage WL3 telephones. It saves the parameters and software for all OpenStage WL3 telephones in a database with the maximum capacity of this data base being 2.500 OpenStage WL3 telephones. The WSG is also required if LDAP access from the OpenStage WL3 telephones and interfaces to the alarming/messaging Server OSCAR are required. The OpenStage WL3 telephones must log on to the WSG to enable the messaging and alarm functions. Each OpenStage WL3 has also an own configuration menu. This menu can be used as simple option for single handset configuration.