Administrative Regulations for Number Portability Services of Telecommunications Enterprises Article 16

Operators shall bear joint liability for their joint actions in accordance with the provisions set forth in these Regulations.
中文原文 電信事業號碼可攜服務管理辦法第16條
經營者依本辦法所為之共同行為,應共同負責。

English translation for reference only; the Chinese text prevails. Not legal advice.