構こう内ない電でん話わ交こう換かん機きMeaningsNoun1. private branch exchange; PBXKanji used構be concerned about内inside電electric話to speak交mingle換exchange機machineComposed of構こう内ないpremises; grounds; campus; compound; precinctsNoun電でん話わtelephone call; phone call; telephone (device); phoneNoun交こう換かんexchange; interchange; switching; reciprocity; barter; substitution; replacement; clearing (of checks, cheques)Noun機きchance; opportunity; machine; aircraft; counter for aircraft; counter for (remaining) livesNoun