What does Compressed Real-Time Transport Protocol (CRTP) compress ?

A. RTP, TCP, and IP headers
B. RTP headers
C. RTP, User Datagram Protocol (UDP), and IP headers
D. Real-Time Transport Control Protocol (RTCP) headers
Correct Answer: C
Section: Voice Video
Explanation
Explanation/Reference:
WAN links use RTP header compression to reduce the size of voice packets. This is also called Compressed RTP (cRTP), which is defined in RFC 2508. As
shown in Figure 14-18, cRTP reduces the IP/UDP/RTP header from 40 bytes to 2 or 4 bytes (a significant decrease in overhead). cRTP happens on a hop-by-hop
basis, with compression and decompression occurring on every link. It must be configured on both ends of the link. It is recommended for slow links up to 768
kbps. cRTP is not used much anyone because slow WAN link bandwidths are seen less. Higher speed links are not recommended because of the high CPU
requirements and they reduce call quality.

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