Summary

• TCP header compression compresses the IP and TCP headers. RTP header compression compresses the IP, UDP, and RTP headers. Header compression reduces delay.

• Class-based TCP header compression enables TCP header compression on a per-class basis. TCP header compression can reduce the header from 40 bytes to 3 to 5 bytes.

• RTP header compression feature (cRTP) can reduce the header from 40 bytes to a 2- or 4-byte header (4 bytes with UDP checksum enabled), which significantly reduces delay on slow links.

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