association exists between two endpoints and both have two IP
addresses assigned, there are four potential paths. Figure 2-13, “Paths
Between Endpoints” (2-22) shows multi-homed endpoints (Endpoint 1
and Endpoint 2) with each SIP PH being assigned two IP addresses.
The number of paths to the destination endpoint is based on the
number of destination IP addresses. The number of source IP
addresses is only relevant to the far packet switch. In Figure 2-13,
“Paths Between Endpoints” (2-22), from Endpoint 1 to Endpoint 2
there are two paths and from Endpoint 2 to Endpoint 1 there are two
paths.
The advantage of multi-homed endpoints is they provide multiple
paths in the IP network. If a specific path is out of service or failing,
an alternate path can be used to send messages.
Association Sets
Association sets are unique to the 5ESS
®
switch. An association set is
a grouping of SCTP associations. The purpose of an association set
for the SIP capability is to support the transport of the SIP messages
used to establish calls over a particular packet group.
Association sets minimize these limitations of associations:
• capacity mismatch of the two endpoints,
• provisioning limitations for the number of associations, and
• inability to route calls on non-functioning associations.
Association set are analogous to signaling link sets in Signaling
System 7 (SS7) networks.
The associations pertaining to a given association set can be assigned
across multiple processor groups. Thus, the call signaling pertaining to
a given packet group can be load-shared across multiple processor
groups.
Figure 2-13 Paths Between Endpoints
Endpoint 1
Endpoint 2
IP Address A
IP Address B
IP Address C
IP Address D
Path 1
Path 2
Path 3
Path 4
E
E
Signaling View
Architecture
....................................................................................................................................................................................................................................
2-22
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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