To have the best possible voice quality and to utilize effectively the available bandwidth， which queuing and compression mechanisms need to be used？（）
- A、class-based weighted fair queuing （CBWFQ）
- B、low latency queuing （LLQ）
- C、priority queuing （PQ） or custom queuing （CQ）
- D、Real-Time Transport Protocol （RTP） header compression
- E、TCP header compression
- F、UDP header compression
正确答案:B,D
答案解析:有
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