... WilliamsAT&T Labs – Research, Shannon Laboratory180 Park Ave., Florham Park, NJ 07932, USAjdw@research.att.comAbstractThis is a demonstration of a voice di-aler, implemented as a partially observableMarkov ... state feature vectors. During opti-mization, a set of template state feature vectors aresampled, and values are computed for each actionmnemonic at each template state feature vector.Finally, ... illustration of the operation of a state -of- the-art POMDP-based dialog system. The systemitself is a voice dialer, which has been operational for several months in AT&T Labs. The system in-corporates...