Refer to the exhibit. What mechanism should be used to increase the bandwidth availability and optimize the link usage throughout the network for voice traffic？（） 
- A、TCP header compression on router R1
- B、TCP header compression on router R2
- C、RTP header compression on router R1
- D、RTP header compression on router R2
- E、payload header compression on router R1
- F、payload header compression on router R2
正确答案:E
答案解析:有
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