Conclusion
As shown in this article, VoiceXML applications can be developed, tested, and deployed using online "development ASPs" such as BeVocal Café and Tellme Studio. If you're interested in learning more about these technologies or are considering building a voice application, these portals are an excellent first stop. Both are stocked with plenty of documentation and examples. My suggestion would be to get a basic prototype working using one of these tools before making the decision to build out the complete hardware/software infrastructure required to deploy a voice application.