null 主叫控制（caller control）：呼叫的释放是由主叫方控制的，作 为主叫，挂机立即释放线路。
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caller control
调用者控制
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The apps allow users to view SMS, caller ID, control music on their smartphones, and track buddies around any of the resort maps that are stored on the HUD, direct-to-eye, in real-time, as well as view trips using Trip Viewer.
ENGADGET: Recon updates its HUD tech, adds new view modes to MOD Live
Until now, only Android smartphone users have been able to take advantage of the SMS, caller ID and music control functions offered by our HUDs.
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