The Bluetooth Special Interest Group (SIG) is the body that oversees the development of Bluetooth standards and the licensing of the Bluetooth technologies and trademarks to manufacturers.
蓝牙特别兴趣小组(SIG)是一个监管蓝牙标准和蓝牙技术和商标的团体。
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The Bluetooth SDP(Service Discovery Protocol) according to SIG specification, is designed for motion enviroment, and has no definition of carrying out service calling.