This is the process whereby a telephone subscriber whose telephone line is maintained by one company, usually a former monopoly provider (e.g. BT), can choose to have some of their calls automatically routed across a different telephone company's network (e.g. Talk Talk) without needing to enter a special code or special equipment.
- Ofcom - Carrier Pre-Selection and Wholesale Line Rental
- - Outbound Carrier Pre-Selection Services from GCI
- - Outbound Carrier Pre-Selection Services from Six Degrees Group
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