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This is an CCITT4 Key 5 Phone Tone.
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Phone tone, CCITT4 Key 9.
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Phone tone, CCITT4 Key 8.
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Phone tone, CCITT4 Key 7.
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This is an CCITT4 Key 6 Phone Tone.
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This is an CCITT4 Key 4 Phone Tone.
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Phone tone, CCITT4 Key
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Phone tone, CCITT4 Key
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Phone tone, CCITT4 Key
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Phone tone, CCITT4 Key