3.5mm and 2.5mm diameter headset/headphone interfaces have been widely used in digital wireless terminals during recent years. Nowadays, the consumer is free to choose either the headset/headphone originally provided by the terminal manufacturer or other ones offered separately. However, the QoS/QoE perceived by users is influenced by both the electrical performance of interface and compatibility between the terminal and the connected headset/headphone. This document specifies critical physical and electrical-acoustical characteristics for the universal headset interface and provides corresponding test methods

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