SilentCallsVictim
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As has been explained previously there are two ways in which the origin of a caller can be identified:
1) CLI - this is the full detail of your number, as given when dialling 1471 or on "caller display".
2) Location information - this is general area from which you are calling, for mobiles this can be the cell location.
Use of the first is covered by data protection legislation which gives you the right to withhold it. Because the second is not personal data it is always available and cannot be withheld.
The second is used by services to route calls to the appropriate national / regional / local call centre. Examples are 111 and 101.
From the information provided it seems likely that this is what is being used on these numbers, but in a primitive form. It seems likely that all calls where an identity can be given are passed through to the rejection message, whereas others are allowed through. As there is no need to incur the cost of checking the mobile cell, it seems that calls from mobiles are allowed through, as no location information is obtained. I imagine that it would not be difficult to treat calls from mobiles in the same way as those from identifiable locations, but as this is not a vital feature it has been deployed in a very simplistic manner.
This explanation is pure speculation, but it seems credible.
On this issue generally, surely SayNoTo0870 should enter into serious and formal correspondence with HMRC and DWP about this issue. The policies of these organisations need to be clearly explained and understood.
I would argue that where a dedicated team of specialist advisers are made available to handle a limited number of calls from overseas, then there is a sound argument for blocking UK calls to those numbers. If, as we are inclined to believe and have evidence to prove, these blocks are simply a way of protecting the benefit of revenue sharing, then this should be acknowledged and defended by the agency.
P.S. Just to complete the picture, the withholding of CLI may be overridden by those with "proper authority", e.g. the police, under the terms of the Data Protection Act. Any telco which released the information to any other body (e.g. HMRC or DWP) would be in serious trouble with the Information Commissioner.
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