| 摘要 |
A cable modem has functions of packetizing a voice signal and transmitting/receiving the packetized voice signal to/from a connected communication device over an IP network. The cable modem includes a communication unit which transmits/receives a signal over the IP network, a detection unit which detects information on the connected communication device from the signal received by the communication unit, and a display unit which displays the information on the connected communication device included in the signal detected by the detection unit.
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