- code phone
- cryptophony
- secret telephone
- secret telephony
- secure voice
- speech privacy system
- 保密: keep a secret density
- 电话: telephone; phone; telephone ...
- 保密电话机: confidential phone; privacy telephone set; secret telephone; secure telephone
- 保密电话通信: secure voice communications
- 保密电话系统: voice security telephone system
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