Telephone caller
A telephone calling device as auxiliary of telephone set including extension set features that audio signal is used as identification mark to realize next calling when telephone set is used to talk. With said device, extension set can be used to realize the function of direct-dial telephone set. Whe...
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| Format: | Patent |
| Sprache: | eng |
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| Online-Zugang: | Volltext bestellen |
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| Zusammenfassung: | A telephone calling device as auxiliary of telephone set including extension set features that audio signal is used as identification mark to realize next calling when telephone set is used to talk. With said device, extension set can be used to realize the function of direct-dial telephone set. When ringing circuit failures, said device is used to call. |
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