利用TAPI实现对普通电话线路的控制。注意：需要使用支持TAPI的语音调制解调器。-Using TAPI realization to ordinary telephone channel control. Attention: Needs to use supports TAPI the voice modem.

这一信道模型能够描述由电离层和对流层反射的短波信道，以及建筑物密集的城市环境。12瑞利衰落只适用于从发射机到接收机不存在直射信号（LoS，Line of Sight）的情况，否则应使用莱斯衰落信道作为信道模型-This channel model is able to describe the HF channel reflected by the ionosphere and troposphere, as well as building a dense urban environment.