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Originally Posted by jimbo
No, wrong, sorry. All the billing/management systems are CLI capable. Equipment has to be physically installed at the switch for Caller Display to be enabled on lines in a region. Many areas have this capability now (in fact, the Celtic regions were upgraded recently), however there are still some areas (both on the ntl network and even one or two exchanges on the BT network) where CLI is not available. It's not just a case of not switching it on - that would be stupid - it's just not physically possible without the equipment being installed/upgraded. This is not an inexpensive undertaking.
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It was reported on these boards that most equipment in the celtic region was capable but because it wasn't 100% it was not switched on at all. I understand that a big cost is in the project engineering/ surveying to decide what has to be changed - it has just never been seen as high priority with ntl - which I believe is a big mistake. Because ntl have patchy coverage and they seem incapable of publishing a definitive list they cannot actively market it. Sure its going to cost, but thats business! How much is it costing ntl not to offer a full telephone service?
I am a complete convert to CLI (with ntl in my area) and if I moved I would not consider a supplier that didn't offer it (especially as my phones now support it).
CLI is also credited with solving hoax an malicious call problems.
I can't find a link re BT coverage of CLI but BT claims to have been fully digital since 1998 - I'm sure caller display and star services are now universal?