| 摘要 |
PURPOSE:To discriminate an incoming call from a specific caller in a sound only and to implement notice to a slave set as a usual call or a specific caller. CONSTITUTION:A telephone number of a registration request from registration circuits 14, 21 is stored in a memory 13, and a telephone number of a caller and a telephone number stored in the memory 13 are compared by a control circuit 12 at the arrival of a call. When a relevant telephone number is in existence, a speaker 15 or 22 of any of a master set 11, slave sets 20, 23 to n only sounds a call tone different from that of a usual call tone, and the other master set 11, the slave sets (20, 23 to n) sound a call tone the same as that the case with no relevant telephone number. |
