The Nuance VoCon 3200 come with sample audio used for batch_fl application voice recognition benchmark.
These are the pcm files:
111.pcm
1422277.pcm
15321.pcm
2260770.pcm
2279180.pcm
adrian_richards.pcm
amanda_virley.pcm
becky_owen.pcm
gillian_kane.pcm
penelope_whitehead.pcm
You can convert this file to wav using sox:
$ sox -t raw -b 16 -e signed-integer -r 16000 111.pcm stream.wav
You can play it this way:
$ mplay stream.wav
Alan C. Assis 