| 摘要 |
PROBLEM TO BE SOLVED: To enable changing a ring tone of all master sets without performing an operation of changing a ring tone from a door phone or a collective door phone for each master set, in a system having a plurality of master set in a housing. SOLUTION: A in-room master set 2 is provided with a ring tone storing section 14 for storing a plurality of kinds of ring tones, an operating section 15 for selecting and setting a ring tone from the section 14, and an in-room master set CPU 11 reading the ring tone selected and set in the section 15 to ring a speaker 13 and operating to transmit ring tone information corresponding to the contents selected and set for an additional master set by the section 15 to the additional master set 3. The additional master set 3 is provided with an additional master set ring tone storing section 24 for storing a plurality of kinds of ring tones, and an additional master set CPU 21 for performing operation for reading a corresponding ring tone from the ring tones stored in the section 24 on the basis of a ring tone information from the master set 2 and ring the speaker 23. COPYRIGHT: (C)2005,JPO&NCIPI
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