If a certain channel of voice uses G.728 encoding (the total length of the Ethernet/IP/UDP/RTP header is 60bytes, the encoding rate is 64kbps), and the packaging time is 20ms, then the IP bandwidth required to transmit this channel of voice is approximately which of the following options?

If a certain channel of voice uses G.728 encoding (the total length of the Ethernet/IP/UDP/RTP header is 60bytes, the encoding rate is 64kbps), and the packaging time is 20ms, then the IP bandwidth required to transmit this channel of voice is approximately which of the following options?
A . 96kbps
B . 88kbps
C . 80kbps
D . 64kbps

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Answer: B