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Re: mysterious calls
BT can trace the number even if CLI is withheld as it is still captured by the signalling traffic initially (may be an issue if it originated internationally of course..).
You cannot however get details of the calling number from BT.You would need to report it to BT as a 'Nusience Call' and they could/would logically follow their tried and tested process for identifying the callers and where prudent they may require you to escalate with the police also (Data Protections prevents BT from identifying the number and passing it onto you directly..). The Police or BT themselves would deal with the calling party on your behalf.
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