English Dictionary

subscriber trunk dialling

noun

(telephony, British spelling) A system of automatic connection of trunk calls through dialling a phone number without operator assistance.

Subscriber trunk dialling is a telephony feature that allows users to make long-distance calls without operator assistance.

意味（1）

(telephony, British spelling) A system of automatic connection of trunk calls through dialling a phone number without operator assistance.

This NER microwave radio telephone link will bring subscriber trunk dialling facilities to no fewer than 3,000 railway telephones at York, Newcastle, Darlington, Middlesbrough and Leeds and points as far north as Berwick-upon-Tweed.