The phrase "telephone lines" refers to the wires or cables that connect telephones and allow people to make calls and communicate with each other over long distances. Full definition
With their network of 19 strategically placed direct telephone lines, this makes contacting the helpful assistants both free and easy for their customers. (binarysoftware.org)
To accommodate business travelers, rooms are equipped with dual telephone lines with voice mail and modem capabilities. (breakingtravelnews.com)
There are also different organisations with telephone lines for children and families as well as websites with resources for families. (kidsmatter.edu.au)