本发明涉及一种方法，该方法用于用户识别模块和至少一个本地设备之间的交互式交换，所述用户识别模块在一个无线电话机内与一个终端相合作。
The invention concerns a method for interactive exchange between a subscriber identification module, co-operating with a terminal in a radiotelephone, and at least a local device.
双忙音多址接入（DBTMA）协议是采用RTS/CTS对话机制来预约信道，通过引入两个窄带带外忙音信号来避免分组间冲突，解决了隐藏终端和暴露终端问题。
The operation of Dual Busy Tone Multiple Access(DBTMA) is based on the RTS/CTS packet and two narrow bandwidth, outofband busy tones. The RTS/CTS dialogue is used to reserve the channel.
双忙音多址接入（DBTMA）协议是采用RTS/CTS对话机制来预约信道，通过引入两个窄带带外忙音信号来避免分组间冲突，解决了隐藏终端和暴露终端问题。
The operation of Dual Busy Tone Multiple Access(DBTMA) is based on the RTS/CTS packet and two narrow bandwidth, outofband busy tones. The RTS/CTS dialogue is used to reserve the channel.
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