SCTP endpoint is established in each network on which a far, peer
SIP entity resides.
Association
An SCTP association is a protocol relationship between SCTP
endpoints. It is composed of the two SCTP endpoints and protocol
state information including verification tags and the currently active
set of transmission sequence numbers (TSNs). An association is
uniquely identified by the transport addresses used by the endpoints in
the association. Two SCTP endpoints can not have more than one
SCTP association between them at any given time.
The SCTP layer initially establishes communication between two
endpoints. The establishment of the SCTP association between the two
endpoints is done with a cookie mechanism that results in the creation
of a transmission control block (TCB). The TCB contains information
about the endpoints and parameters governing how the endpoints will
communicate. Figure 2-18, “Cookie Mechanism” (2-36) illustrates the
exchange.
Below are the steps used to establish an association.
1. The four-way handshake is initiated by the initializing packet
switch with an INIT message.
2. The far packet switch creates a cookie and sends it to the first
packet switch in an ACK message.
Figure 2-11 SCTP Endpoints
Packet Group
7000
Office A Office B
Packet Group
7500
SIP PH
NIC
SCTP Port: 5060
IP1: 144.12.1.20
IP2: 144.12.1.21
Edge
Router
Edge
Router
IP Network
SIP PH
NIC
SCTP Port: 5060
IP1: 161.54.15.6
IP2: 161.54.15.7
SCTP Endpoint SCTP Endpoint
Signaling View
Architecture
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-19
To Next Page
Loading...
Need help?
General
