What are three factors used to determine the amount of bandwidth that is required for a single VoIP call？（）
- A、codec
- B、link speed
- C、Layer 2 encapsulation
- D、packet overhead （IP/UDP/RTP）
- E、link delay
- F、total number of simultaneous calls that are allowed
正确答案:A,C,D
答案解析:有
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