To provide a specialized resource function within the telephone network, server apparatus is described having a first interface for communication with a signalling network of a telephone network and a second interface for communication with a media gateway that has at least one bearer channel to the telephone network. The apparatus has a control arrangement for enabling the apparatus to provide, through the second interface, a document, such as a VoiceXML document, for rendering by the media gateway, the document being provided at least partly under the control of information received from a service control subsystem of the telephone network in an interaction through the first interface. An associated media gateway and method are also described.