Southbank Telephone Exchange

Southbank telephone exchange is located in London. It serves numbers in three dialling codes: 0121 (Birmingham), 01955 (Wick) and 020 (London).

Why does this exchange serve area codes that are not local? The most likely explanation is that these are Centrex numbers, which may be delivered to the customer premises over private networks rather than the public telephone system. In some cases, Centrex exchanges can, therefore, be a considerable distance from the premises to which the numbers are allocated.

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