Patent ID: 7209732

Claim:
A security device for a cellular telephone, comprising: a cellular telephone interface for coupling the device to the cellular telephone; a analog scrambler coupling a microphone and a speaker to the cellular telephone interface, the analog scrambler being able to scramble a first voice audio from the speaker and unscramble a second voice audio from the cellular telephone, wherein (1) the first voice audio travels in a transmit path comprising the microphone, the analog scrambler, and the cellular telephone interface, and (2) the second voice audio travels in a receive path comprising the cellular telephone interface, the analog scrambler, and the speaker; an audio recorder coupled to the transmit path and the receive path for recording and playing back the first and the second voice audios, the audio recorder comprising: a memory; a processor comprising: an input coupled to the transmit path and the receive path between the analog scrambler and the cellular telephone interface for recording the first and the second voice audios in the memory; and an output coupled to the receive path at the analog scrambler for playing back the first and the second voice audios from the memory.