housephone

[ hous-fohn ]
/ ˈhaʊsˌfoʊn /

noun

a telephone, used for making calls within a hotel or apartment house, that does not have a direct line to an exchange and whose calls are routed through the building's switchboard.

Origin of housephone

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019