| 摘要 |
A gateway apparatus receives a packet from the mobile high-speed network or from the IMS network, performs protocol conversion of the packet, converts an audio compression-encoding scheme, and outputs a resulting packet to the IMS network or the mobile circuit switched network, and receives a circuit switching protocol signal from the mobile circuit switched network or a packet from the IMS network to perform protocol conversion, converts an audio compression-encoding scheme, converts a resulting signal into a packet, and outputs the packet converted to the IMS network or the mobile high-speed network.
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