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Abstract

A method for use in an electronic switching system (ESS) analyzes M.times.N sets of line signals communicating between itself and at least one other ESS. At a first step, two previous sending and receiving line signals for a voice channel from each of the two ESS's are provided as a first pair of line signals. At a second step, two current sending and receiving line signals from each of the two ESS's form a second pair of line signals. At a third step, each of the line signals in the second pair is compared with its corresponding line signal in the first pair to check whether at least one line signal in the second pair is different from the corresponding line signal in the first pair. At a fourth step, if the checked result is negative, the second and the third steps are repeated for a predetermined duration, and if otherwise, a time interval value between one of the line signals in the second pair and its corresponding different line signal in the first pair is calculated. At a fifth step, it is checked that the calculated time interval value exists within its corresponding range among a predetermined set of ranges of time duration of line signals of the channel to determine the status of the different line signal in the first pair. At a final step, the steps from the second to the fifth are repeated until all of M.times.N sets of line signals of N voice channels are processed.

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