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  • bitdays.co.kr/2021/09/05/%ec%84%a0%eb%8f%84%ea%b5%ad-%eb%8d%b0%ec%9d%b4%ed%84%b0%ea%b0%80%ec%9e%88%eb%8a%94-2025-%eb%85%84-voip-%ec%9d%b8%ed%84%b0%eb%84%b7-%ed%94%84%eb%a1%9c%ed%86%a0%ec%bd%9c%ec%97%90-%ec%9d%8c%ec%84%b1/ (port 80)