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  • news-i.co.kr/%eb%b3%b4%eb%8f%84-%ec%9e%90%eb%a3%8c/537390/pbx-%ec%a0%84%ed%99%94-%ec%86%8c%ed%94%84%ed%8a%b8%ec%9b%a8%ec%96%b4-%ec%8b%9c%ec%9e%a5-2021-%ec%b5%9c%ec%8b%a0-%ea%b0%9c%eb%b0%9c-%ea%b0%80%ec%9e%a5-%ec%a4%91%ec%9a%94%ed%95%9c-%ea%b3%b5%ea%b8%89/ (port 80)