Group 1 - The article discusses the definition and classification of telecommunication services, which include basic telecommunication services and value-added telecommunication services [6][7][8][10]. - Basic telecommunication services involve voice call services and the leasing or selling of bandwidth and other network elements [9]. - Value-added telecommunication services encompass services such as SMS, MMS, data transmission, and internet access [11][12]. Group 2 - The article outlines the regulations regarding rental income as per the Corporate Income Tax Law, stating that rental income is recognized based on the payment date agreed upon in the contract [17][18]. - It specifies that if the rental agreement spans multiple years and the rent is paid in advance, the income can be recognized evenly over the rental period [18].