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d2334800
2011 Oct 11
2
BT line: unavailable vs withheld numbers?
On a BT line, how do I determine whether the number on an incoming call has
been deliberately withheld (by dialling 141) or is merely unavailable (e.g.
because it originated from overseas or passed through some ancient switching
equipment) ?
In the first case, I want the caller to be played a message to the effect that
we are not at home to anonymous cowards but if their business is