Thomas Ball Veta Bonnewell Peter J. Danielsen Peter Mataga Kenneth Rehor Speech-enabled services using TelePortal<sup>TM</sup> software and VoiceXML<sup>star</sup>. 98-111 2000 5 Bell Labs Technical Journal 3 http://dx.doi.org/10.1002/bltj.2238 db/journals/bell/bell5.html#BallBDMR00