| 摘要 |
PURPOSE:To perform restoration of busy tone of output sender, by detecting the over-pulse with the dial pulse generating circuit, by discriminating the final numeral reception in timing, if the called number is not stored in the storage relay. CONSTITUTION:The outgoing call resistor OR stores the called number dialed with the calling subscriber SUBA, has the outgoing sender section OS which can deliver any of the DP signal system and the MFC signal system, and commonly uses the timing discriminating method as the identification method of the final character of the called number. When the delivery of the called number is requested with the backward signal with the MFC signal system, timing identification is made for the final numeral reception. Further, when the called number is not stored in the storage relay, the dial pulse generating circuit DPG and the dial pulse counting circuit DPC are started and the over-pulse is detected. Thus, the restoration of busy tone for the outgoing sender OS can made. |
