Patent ID: 7826604

Claim:
A method for detecting the addition of a third party to a pre-existing telephonic connection between a first party and a second party, said method comprising: generating identification data; subdividing the identification data into a plurality of subdivisions; encoding the plurality of subdivisions onto a carrier signal to create a spread spectrum modulated identification signal, the spread spectrum modulated identification signal comprising the subdivisions of the identification data encoded on a plurality of frequency bands using a predetermined sequence; adding the spread spectrum modulated identification signal to a telephone signal to form an encoded telephone signal, the spread spectrum modulated identification signal being imperceptible to a human listener of the telephone signal; transmitting the encoded telephone signal across a telephonic connection; receiving the encoded telephone signal at a remote location; extracting the plurality of subdivisions of the identification data from the spread spectrum modulated identification signal; and assembling the plurality of subdivisions of the identification data to re-create the identification data using the predetermined sequence.