Subscriber trunk dialling

（重定向自Subscriber trunk dialing）

Typical signboards of STD booths (kiosks from where STD calls can be made) in India

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.

单词	Subscriber trunk dialing
释义	Subscriber trunk dialing 英语百科 Subscriber trunk dialling （重定向自Subscriber trunk dialing） 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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