350-029 356Q的问题205，请帮忙解释

beir

我查的是IP/UDP/RTP会被压缩为2-4bytes，那怎么得出答案为D呢

Referring to the exhibit, if RTP header compression is used on the link, the header??s overhead on the
voice packet will be reduced by what percent?

A. from 50% to 25%
B. from 50% to 20%
C. from 70% to 20%
D. from 70% to 33%
Correct Answer: D

kkisho

thanks :)