From Longman Dictionary of Contemporary Englishswitchboardswitch‧board /ˈswɪtʃbɔːd $ -bɔːrd/ noun [countable] TCTa 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).
Examples from the Corpus
switchboard• He doesn't like using hotel switchboards to transmit orders.• The White House switchboard tells her the President is in conference.• These are, possibly, switchboards of some sort.• You manage a telephone switchboard for a large governmental agency.• The girl who sat in the reception area and answered the switchboard was called Lucinda.• Extra operators had to be brought in to handle the switchboard overflow.• Residents jammed the switchboard of city authorities asking whether it was safe in the area.• One was typing and the other was operating the switchboard.jammed the switchboard• Residents jammed the switchboard of city authorities asking whether it was safe in the area.From Longman Business Dictionaryswitchboardswitch‧board /ˈswɪtʃbɔːd-bɔːrd/ noun [countable] a system used to connect telephone calls in an office building, hotel etcCalls must pass through the switchboard with the minimum delay.Contact theswitchboard operator to arrange an early morning call. 