[计] in-house communication system, in-plant system, intercommunicating system, intercommunication system

nèi bù tōng xìn xì tǒng ㄋㄟˋ ㄅㄨˋ ㄊㄨㄥ ㄒㄧㄣˋ ㄒㄧˋ ㄊㄨㄥˇ