| 摘要 |
sensing a communication state between a fixed device and a radio device; making a phone call with an official subscriber or communicating with a user having the fixed device through an interphone; communicating with another user having the other interphone under use of a data transmission/reception part that is not used in the fixed device; if a communication request signal is applied through the official line, normally making the call by the first second communication devices; and making the call by the interphone by selecting some of the official lines, or communicating with the user having the radio device through the other interphone.
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