Administrative Regulations on the Establishment and Operation of the Dedicated Taxi Telecommunications Network Article 19

The telecommunications network establisher shall install a 24-hour automatic recording system to record the conversations and retain the records for one week.The competent authority of highways shall accompany the competent authority to check records as described in the preceding Paragraph on a regular basis each year. Whenever deemed necessary, the competent authority of highways may conduct irregular inspections.
中文原文 計程車專用電信網路設置使用管理辦法第19條
電信網路設置者須設置二十四小時自動錄音系統,記錄話務內容,並保存一週。
公路主管機關每年定期會同主管機關查核前項紀錄。
必要時,公路主管機關得不定期查核。

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