Busy Redial and other similar features on some telephone systems

Besides the term Busy Redial for the feature at

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other similar features are available on some other telephone systems that automatically detect when the line you're calling is activated?... useful for reaching people whose telephones haven't any advanced features when there's no answer or a busy signal.

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the zak
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Click test. Press the tip against the jack sleeve and if you hear a sharp click it means the line is busy.

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