| 摘要 |
Each of gateways GW1, GW2 includes packet-switched network control portions 32, 33 connected to packet-switched networks, a circuit switched network control portion 35 connected to a circuit switched network, and a call control portion 31 for controlling a communication call together with the packet-switched network control portions and the circuit switched network control portion and for monitoring the traffic of the packet-switched network. The packet-switched network control portion includes plural circuit connection portions 37, 38 which can be connected to plural circuits, plural CODECs 34 having different compression ratios for enabling real-time type data transmission, and a storage data processing portion 32 for enabling store-and-forward type data transmission.
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