3. The first packet switch returns the cookie in an ECHO message
to the far packet switch.
4. The far packet switch validates the cookie information and
returns the cookie in an ACK message.
The endpoint at the initial packet switch is associated with the
endpoint at the terminating packet switch through mutual knowledge
by the TCBs and the implicit agreement to transmit messages to and
receive messages from each other. Either endpoint in an association is
allowed to initiate the establishment of the association.
Only one association may exist between two SCTP endpoints.
However, a number of concurrent SCTP signaling flows may exist
between those endpoints. In SCTP, these flows are called streams.
Each SIP message contains an association and a stream number.
Messages that are part of the same transaction are given the same
stream number. For example, all SIP messages associated with a given
call are carried over the same SCTP stream.
One near endpoint can also be associated with multiple far endpoints.
Figure 2-12, “Multiple SCTP Associations” (2-21) illustrates office A
containing one endpoint that has associations with more than one
Signaling View
Architecture
....................................................................................................................................................................................................................................
2-20
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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