| 摘要 |
PROBLEM TO BE SOLVED: To provide a communication device capable of reducing degradation of sound quality by easily making circuit class setting even when a terminal adaptor is included.SOLUTION: A master unit includes detection means that detects whether the same is connected to a terminal adaptor. Before or after installation, the communication device detects whether the communication device is connected to the terminal adaptor or directly connected to a station exchanger on an analog telephone line network and performs circuit class setting to set the amplification degree etc. based on the result. |
