Subscriber trunk dialling
Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a telephone system allowing subscribers to dial trunk calls without operator assistance. The term was introduced when it first became possible for long-distance calls to be dialled directly, and is now rarely used where calls to any destination can be dialled.
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Subscriber trunk dialling
Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a telephone system allowing subscribers to dial trunk calls without operator assistance. The term was introduced when it first became possible for long-distance calls to be dialled directly, and is now rarely used where calls to any destination can be dialled.
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Subscriber trunk dialling (STD ...... ny destination can be dialled.
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Subscriber trunk dialling (STD ...... ny destination can be dialled.
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Subscriber trunk dialling
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