| 摘要 |
PURPOSE:To prevent ineffective holding of a line by opening automatically the line when a message is finished in the voice message service system for an automatic exchange. CONSTITUTION:A message end signal to indicate the end of a message is recorded on a tape recorder TR at message recording. In transferring the message to an opposite subscriber telephone set EXT-B, when the end signal is detected by the 2nd pushbutton signal receiver RCV-B, a restoration signal is transmitted to a trunk TRK-B and the line between the subscriber telephone set EXT-B and the tape recorder is released after a prescribed time. |
