UK Telecoms (uk.telecom) Discussion of UK telecommunications.

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Old March 20th 08, 12:59 AM posted to uk.telecom
PhilT PhilT is offline
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Default BT not passing incoming international Caller ID as it's not

On Feb 24, 9:48 pm, "Michael R N Dolbear" wrote:

And also in the above document.

15.3 The draft Communications Bill creates a new offence, the
persistent misuse ofan electronic communications network or electronic
communications service,where misuse of a network or service causes
another person unnecessarily to suffer annoyance, inconvenience or
anxiety. This legislation may be in point where end-users knowingly
cause unauthentic or misleading CLI information to be sent. ==

Which may answer the spoofing point.

you haven't defined "spoofing" but the OFCOM code of practice for
CallerID has 4 categories (or maybe 5) of acceptable presentation
numbers (CLIP) some of which do not require that you own the number in
any way.

An example would be a VoIP server forwarding calls received on a BT
line and presenting the callers CLI - just like a mobile or BT
exchange forwarding retains the original CLI then a VoIP service can
do so under the OFCOM rules.

So an "authentic" CLI can be sent that is not one owned by the sender.


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Old April 18th 13, 12:30 PM
Felim_Doyle Felim_Doyle is offline
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BT themselves regularly 'spoof' their own number. Many calls from BT sources 'present' as 08003289393 so it's hardly illegal, however spoofing a number which is not yours may be.

You can try this yourself by calling the BT Line Test Facility on 17070 (free of charge) and selecting 1 for Ring-Back Test. Hang up and the automated system will call you back from 08003289393.

A few years ago, I was receiving calls apparently from a South African number. Initially the calls came through with an SA country prefix, then as an incorrect 0800 number and finally as the correct 08000 number (note the extra zero) for Carphone Warehouse. It seemed to be an experiment gone wrong and the calls stopped after a couple of days. However, as the calls were showing on my BT line caller display, they must have originated in the UK.

Last edited by Felim_Doyle : April 18th 13 at 01:37 PM Reason: Correction

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