Which headers are compressed when cRTP is used?

A.
the UDP and RTP headers

B.
the IP header only

C.
the TCP header only

D.
the RTP header only

E.
the IP, UDP, RTP headers and the first byte of the payload

F.
the IP, UDP, and RTP headers

Explanation:
Compresses a header at various layers of the Open System Interconnection (OSI)
reference model. Examples include Transmission Control Protocol (TCP) header compression,
compressed RTP (cRTP), and compressed Internet Protocol/User Datagram Protocol (IP/UDP).
Link:
http://www.cisco.com/en/US/tech/tk543/tk762/technologies_tech_note09186a0080108e2c.shtml#h
ead