Regulations Governing Information to be Published in Order Tickets, Trade Reports, and Reconciliation Statements Prepared by Securities Brokers Upon Receiving Orders to Buy or Sell Securities Article 5

Where an order is submitted via telephone or telegram or in writing, the securities broker receiving the order shall first complete an order ticket under the preceding article and then have it signed by the principal at the time the principal delivers the price or the securities after the trade is executed; provided, this requirement of signing shall not apply where a Consent to Settlement by Book Entry has been signed, or where rules specify that it is not necessary to sign such a Consent to Settlement and the trade confirmation has been carried out and the record has been retained.
中文原文 證券經紀商受託買賣有價證券製作委託書買賣報告書及對帳單應行記載事項準則第5條
委託人以電話、電報、書信委託者,受託證券經紀商應先填製前條所定之委託書,於成交後委託人交付價金或證券時,由委託人補行簽章。
但已簽具「委託人交割款券轉撥同意書」,或依規定免簽具前揭同意書而已辦理交易確認並留存紀錄者,不在此限。

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