On Wed 03/11/2021 07:32, Pamela wrote:
> On 17:54 2 Nov 2021, Woody said:
>
>> On Tue 02/11/2021 17:22,
notya...@gmail.com wrote:
>>> On Tuesday, 2 November 2021 at 15:57:28 UTC, Pamela wrote:
>>>> If you call an 0800 number then can the other party see your
>>>> number even if you withhold it?
>>>>
>>>> As the receiving party are paying for the call, I'm wondering if
>>>> they can log incoming numbers (perhaps for billing purposes).
>>>
>>> No, well not legally, unless it happens to be the police. As it
>>> happens the calling number is carried in the call, and some PABX's
>>> can log this...
>>>
>>
>> The calling number is carried with the call - well, almost - along
>> with some data flags such as International, and one of which is
>> withheld number. The destination exchange responds to the flag and
>> withholds the number.
>
> I am not clear what you mean by "destination exchange". Would a
> destination exchange include a company's PABX which the other poster here
> mentions?
>
The destination exchange is the BT exchange to which your domestic
telephone is attached. It recovers your call from the incoming data
stream that started at the exchange to which the caller is connected,
reads the flags, and acts appropriately.
This is why if you get a scam call from a Voip line with a sender
selected number you can sometimes have CLI showing International
followed by a correctly formatted UK number, or what appears to be an
international call but without the International flag albeit I
acknowledge that not all phones show them every time.
>> The emergency service system ignore the flags so they can see the
>> originating number.
>
> What about governement organisations like HMRC, where some departments
> (such as VAT collection) seem to have more authority than usual to
> override personal privacy?
>
> Alternatively a local council with powers to investigate who's who to
> collect council tax?
>
I cannot confirm the above but as far as I know only the emergency
services have that facility.
Emergency services certainly comprises Fire, Police, Ambulance,
Coastguard, Mines Rescue (if they still exist) and a couple of others
but I doubt Government departments (bar the secret squirrels) or local
authorities have such access. BUT I could be wrong.