Before calling the host to be tested with your NUI (or via your direct X.25 link), you may want to see if the remote DTE accepts reverse-charge calls. Your customer may not be aware of this network configuration, and you would want to note this in your security report.
In this case, the syntax and procedure are the same as for an X.28 call using an NUI, except you won't insert an NUI but only the NUA (or the full X.121 address, if your X.25 carrier supports the international reverse-charge facility) you want to test.
SprintNet, by default, allows international reverse-charge in their subscription contracts. That's why their X.25 network is scanned so extensively from all over the world, especially from Russia and South America.
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