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Here is a recording of Glenn Mulcaire using social engineering to reset the PINs to voice mailboxes to which he did not have authorised access. (At least, that's my understanding.)

He appears to say to the operator, "Do you want the DDNs on these, or - you should have them anyway, shouldn't you?" The operator replies, "I'll have that [information] here."

My question is: what are the DDNs to which Mulcaire is referring? I.e. which words does the initialism stand for, and what thing is referred to by the name composed of those words?

Here is a possibly related question.

closed as off-topic by schroeder, Xander, Steve, Mark, TildalWave Jun 30 '14 at 22:37

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about Information security within the scope defined in the help center." – schroeder, Xander, Steve, Mark, TildalWave
If this question can be reworded to fit the rules in the help center, please edit the question.

  • 2
    Direct Dial Number. I got that from a 5 second Google search. – schroeder Jun 30 '14 at 19:06
  • Indeed, you are correct. Evidently my Google-fu failed me first time around. Feel free to make this into an answer so that I can mark it as correct. – sampablokuper Jun 30 '14 at 22:10
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DDN stands for Direct Dial Number.

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