SCTP Programmer's Guide

COOKIE-ECHO packet. As a result, the conversation ends without the server
allocating any resources for the connection.
4. Host B responds with a COOKIE-ACK chunk and allocates resources for the
connection.
The connection is now established between Host A and Host B. Host A can now
start sending data to Host B.
In SCTP, the transfer of data may be delayed because of the additional handshake. The
four-way handshake may seem to be less efficient than a three-way handshake. To
overcome this delay, SCTP permits data to be exchanged in the COOKIE-ECHO and
COOKIE-ACK chunks.
SCTP Packet
SCTP transmits data in the form of messages and each message contains one or more
packets.
Figure 1-4 illustrates an SCTP packet format.
Figure 1-4 SCTP Packet Format
SCTP Architecture 23