Signaling View
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Overview
The 5E-XC supports SIP on the following transport layers:
• Stream Control Transmission Protocol (SCTP)
• User Datagram Protocol (UDP)
This section defines the concepts of endpoints, associations, and
association sets for the stream control transmission protocol (SCTP),
transport layer, and the concept of UDP paths for the UDP transport
layer.
Figure 2-10, “SIP Protocol Stack” (2-17) shows the protocol stack
supporting SIP signaling with either a SCTP or UDP transport layer.
For more detailed information about the layers of the protocol stack
refer to the Session Initiation Protocol (SIP) - Interface Specification,
235-900-344 document.
Transport Layer Comparison
Table 2-1, “TCP/UDP/SCTP Comparison” (2-17) highlights some of
the differences between the TCP, UDP, and SCTP transport layers.
Table 2-1 TCP/UDP/SCTP Comparison
TCP UDP SCTP
byte-oriented stream message-oriented
stream
message-oriented
stream
multiple sockets use
more resources
simpler protocol
needs less resources
multiple streams uses
less resources
single-homed single-homed multi-homed
vulnerable to
synchronize (SYN)
bit packet attacks
connectionless
protocol is vulnerable
to attack
4-way association
startup procedure,
security cookie
Figure 2-10 SIP Protocol Stack
SIP
SCTP/UDP
IP/ICMP
Ethernet
100BaseT
Architecture
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235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-17
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