The voice data encapsulation policy is: for voice data entering Ethernet from PSTN and exchanging among Ethernet, MAC address is acted as addressing object when voice data is encapsulated;
语音数据的封装策略是：由PSTN进入以太网和在以太网内部交换的分组语音数据，封装时以MAC物理地址作为寻址对象；
The voice data encapsulation policy is: for voice data entering Ethernet from PSTN and exchanging among Ethernet, MAC address is acted as addressing object when voice data is encapsulated;
语音数据的封装策略是：由PSTN进入以太网和在以太网内部交换的分组语音数据，封装时以MAC物理地址作为寻址对象；
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