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Technology for measurement of durations of GSM audio calls has been developed. Call duration was measured by using end-to-end method, making calls between two GSM terminals (Siemens MC35i). One GSM terminal was mobile and equipped with a test signal generator. Pseudo noise DTMF-like signals were used as test signals transmitted through the GSM channel. Receiving GSM terminal was connected to the PIC16F84A...
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