The rate books you are referring to is not part of the default rate books that comes with the TNG installation. It must be a custom ratebook that was configured on site at some point. Which calls it will cost, etc. depends on how it was configured.
Our ratebooks will have standard naming conventions, for example rate books for South Africa will start with "za_". The rate book you should be looking at is 'za_centracom'. To upgrade to the TNG version that will include it, please refer to forum post:
Where do I find CentraCom ratebook?If you want to see if you already have the version that includes this rate book, please refer to forum post:
Which ratebooks does TNG have?Please use the 'za_centracom' ratebook.
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