switch‧board /ˈswɪtʃbɔːd $ -bɔːrd/
noun [countable] a system used to connect telephone calls in an office building, hotel etc, or the people who operate the system:
switchboard operators Hundreds of callers jammed the switchboard trying to win the tickets (=there were too many calls for the switchboard to deal with). [TahlilGaran] Dictionary of Contemporary English ▲