The Hills District Historical Society is taking people back to the days when a family shared one telephone and it was attached to the wall.
Its new exhibition, Let's Communicate, includes antique telephones from the Transport Signal and Communication Museum at Kurrajong and morse code demonstrations by the Sydney Morsecodians.
Radios, Morse code, gramophones, typewriters, early newspapers and cards will also be on display at the museum in Balcombe Heights on May 3 and 4.
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But the pièce de résistance for society president Julie Graham is a red telephone box that used to be in North Rocks Road, North Rocks (near Lakeside Avenue).
"We wanted it restored and back in the museum especially for that weekend," Ms Graham said.
She said the booth was donated to the museum about a year ago by Don McGregor, of Baulkham Hills, who had kept it in his backyard.
"It had rotting timbers in it, so it needed to be restored," Ms Graham said.
"Jonathan Hinde, a teacher at Crestwood High School, has been working on it for us and Don is just now painting it."
She said the Ford Anglia Prefect Car Club of Australia would have a display on May 3 and there would be market stalls both days of the exhibition.
Local radio station Alive 90.5, in building 9, will also open its studio to the public for the weekend.
■ Let's Communicate is at the Hills District Historical Society museum in building 10, Balcombe Heights Estate, Baulkham Hills, May 3-4, 10am-4pm.
■ Details: Julie Graham, 9655 1148 or email firstname.lastname@example.org.