The voice processing equipment market has expanded to include both large and small businesses, and the influence of voice processing—evidenced in voice mail messages and voice response systems—has become widespread. AT&T systems such as the Conversant® Voice Information System and the AUDIX voice messaging system have been designed to enhance both business and personal telecommunications. This paper explores the architectures of AT&T's Conversant and AUDIX systems in terms of hardware, software, and application design.