Subscriber trunk dialling ( std ) is inaugurated in the uk by queen elizabeth ii when she speaks to the lord provost in a call from bristol to edinburgh 1958年用戶長途直撥( std )系統(tǒng)由英國由女王伊麗莎白二世舉行開機(jī)典禮,她在一個從布里斯托爾到愛丁堡的長途撥叫中與對方城市的市長通話。
Subscriber trunk dialling (STD, also known as subscriber toll dialling) is a term for a telephone system allowing subscribers to dial trunk calls without operator assistance.