Calling an iNum telephone number [telecom]

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A decade ago some Internet geeks set up a new kind of telephone number

- an "iNum" telephone number. A regular telephone number always starts with a country code. Calls to Switzerland for example use a country code of "41". Calls to North America use a country code of "1". Just by looking at the telephone number, you can see what country it is associated with. But not iNum numbers.

The idea of an iNum number (see Wikipedia article) is that it tries to accomplish an end run around the PSTN (public switched telephone network). I have obtained some iNum numbers and I will be trying to figure out how best to put them into use.