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Originally Posted by bob_builder
What actually happens is that the call is automatically routed from BT to NTL at the local exchange as any call to NTL would be.
The CallerID information is passed on to NTL by BT. What happens then is it gets routed through the NTL equipment to your local street cabinet via optic fibre where it then gets sent to your house via wire. If any of that equipment does not support CalllerID then that does not arrive at your phone.
Certian parts of NTL support CallerID in whole, certain parts partially and some not at all. As the older equipemnt dies it will be upgraded with newer stuff that will probably support CallerID so it will take a long time to upgrade everybody.
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Thanks for that, Bob. Any idea what kind of timescale we are talking about here please?