We would have been pleased if we achieved nothing more than a system that passed a Turing test - i.e. that wrote a symphony but didn't necessarily know it had done so.

To pass the Turing test, and thus be considered intelligent, a program must fool a human being into believing that it is another human being.

An unscheduled call that rings on my phone fails the conversational Turing test: it's almost certainly junk, so I ignore it.