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Originally Posted by gooner4life
Are you sure timmy? as far as I know when a port is accepted the number is deleted from our switch and added to BT's and it couldnt really be call forwarding as it would need to be on the BT switch for the equipment ID etc wouldnt it?
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That's true in that the number is added to BT's switch, so that facilities such as 1471 etc work properly.
However, because the number is still owned by the "donor" (in this case NTL), it's still on their network and is forwarded to the correct BT switch by use of a prefix code, and vice versa when BT is the Donor and ntl is the new telco providor.
Using an example of a "failed" number port I've seen:
A customer ported their BT number to ntl, however BT hadn't set the number on their switch to forward to the correct ntl switch.
As a result, if a BT customer called that customer then their BT Phone would ring, whereas if an NTL customer was to call the customer (using the same BT number) then their NTL line would ring...