: Voice user interfaces (VUIs) have become very common for telephone based applications, e.g. call centers and value-added services. Though there are advantages for further fields of application as well, they are still rarely used. This paper describes the range of aspects to be considered before implementing VUIs in industrial environments. It supports the decision process on whether or not a VUI is reasonable for a certain context of use. In order to create an overview of the relevant aspects, this paper refers to findings from the literature and integrates insights gained from interviews with carriers as well as suppliers of VUI applications.