| 序号 | 型号 | 描述 | 大小 | 厂家Logo | 下载 |
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| 1 | MX643 | Call Progress Tone Detector wlth Special Information Tones(SIT) | 210K |
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| 2 | MX643 | International Special Information Tone Identification | 215K |
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| 3 | MX643DW | Call Progress Tone Detector wlth Special Information Tones(SIT) | 210K |
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| 4 | MX643P | Call Progress Tone Detector wlth Special Information Tones(SIT) | 210K |
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