Silent calls from 0000 000 001

[#1]

Two days ago we received a silent call from 0000 000 001, and just got another one today. Both caller display and 1471 report the number as 0000 000 001.

Anyway to find out where this is coming from?

Regards: Elliott.

[#2]

No way to do that I'm afraid, simply treat it with the contempt it deserves. Or press your phone's mute button and leave it off the hook for 10 minutes or feed them some music on hold!

[#3]

Also, why is it even coming up as 0000 000 001, that surely is not a valid number.