Regulations for Administration on Fixed Network Telecommunications Business Article 58
An operator shall provide directory services to its users upon commencement of its operation, and shall begin providing directory services to users of other operators pursuant to the time table promulgated by the competent authority.The directory services referred to in the preceding Paragraph shall at least include the services of 104, 105 and 106.Operators shall mutually provide to each other the information pertaining to their subscribers as necessary for provision of the directory services, except for information requested by subscribers to be kept in confidence.The provision of and inquiry to subscribers' information as referred to in the preceding Paragraph shall be made on a reciprocal basis.The charges for provision of directory services shall be determined on the basis of costs of the respective directory services.
中文原文 固定通信業務管理規則第58條
經營者對其使用者應於開始營運時提供查號服務；對他經營者之使用者，其開始提供查號服務之時程，由主管機關公告之。
前項查號服務之項目，至少應包括一○四、一○五及一○六之服務。
經營者間應相互提供查號服務所需之用戶資訊。
但用戶要求保密之資訊，不在此限。
前項用戶資訊之提供及查詢，應依互惠之原則辦理。
提供查號服務之收費，不得超過查號服務之成本。
前項查號服務之項目，至少應包括一○四、一○五及一○六之服務。
經營者間應相互提供查號服務所需之用戶資訊。
但用戶要求保密之資訊，不在此限。
前項用戶資訊之提供及查詢，應依互惠之原則辦理。
提供查號服務之收費，不得超過查號服務之成本。