Those calls are uncanny. We are this close to getting systems to pass the telemarketer subset of the Turing test.
The "68" recording had me wondering if this was a real person, which was terrifying. Some people have been saying this could be a soundboard operated by a person, which does seem plausible. I probably would have said Cirrus, Socrates, particle, decibel, hurricane, dolphin, tulip.
I love that the program knows not to respond with any audio clips that were already used. Classic robot giveaway.