| 摘要 |
A method of initiating a secure call between a first secure terminal unit and a second secure terminal unit over a digital transmission link, the first secure terminal unit being connected to a first secure interface unit and the second secure terminal unit being connected to a second secure interface unit, includes transmitting a switching initiate request from the first secure interface unit to the second secure interface unit, returning a switching acknowledgement from the second secure interface unit to the first secure interface unit in response to the switching initiate request, and transmitting a first control message packet from the first secure interface unit to the second secure interface unit.
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