| 摘要 |
PURPOSE:To obtain the extension call system for a cordless telephone set which obviates such a problem as a radio wave interference, etc., by using one set of transmitting/receiving part in a master machine. CONSTITUTION:When an extension call request to another slave machine C is executed to a master machine A from an arbitrary slave machine B, the master machine A selects two free call channels in which an interference of a slave machine frequency becomes minimum among plural call channels, transmits these two free call channels to the calling side slave machine B and the called side slave machine C, respectively and allocates them to each slave machine B, C. Thereafter, by using the slave machine frequency of these call channels, an extension call is executed directly by the calling side slave machine B and the called side slave machine C. |
