trunk call

She also made the UK's first "trunk call" - a long distance call made within the same country - in 1958.

Aides point to her having made the first phone trunk call from Bristol to Edinburgh back in 1958.

That would make it a trunk call - get it?

Telephone calls seemed incessant, and the operator downstairs was unintelligent and twice cut Miss Vivian off in the midst of an important trunk call.

The duty of this attendant during business hours is to answer trunk calls from the main office and finding out what party is desired, call up the proper station on the intercommunicating system.