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Discover Ludwig"telephone line" is correct and usable in written English.
It can be used to refer to a physical connection or wire that allows for telephone communication. Example: "I called the customer service hotline, but the telephone line was busy."
Dictionary
telephone line
noun
The infrastructure which allows a single telephone to be connected to the network and conduct independent calls.
Exact(58)
4. Telephone line.
(iii)Readily-available telephone line.
The flood had cut his telephone line.
A free telephone line will open today.
The telephone line goes silent.
His telephone line was cut.
Silence down the telephone line.
There is also a dedicated telephone line.
But his telephone line was still working.
Similar(2)
A direct cable-and-telephone line links Brioni with Belgrade.
Telephone Line is also known as telecom, communication, wire.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com