There are 3 service selection states:
• Serving - indicates that a SIP PH is performing the signaling role
for the SIP layer, transport layer, and IP layer. If the processor
group supports an SCTP near endpoint for the transport layer,
then the serving SIP PH establishes the SCTP associations
terminated on that endpoint, connecting sockets between SCTP
and the SIP layer when the associations are established to the far
end. If the processor group supports UDP paths for the transport
layer, then the serving SIP PH connects the sockets between UDP
and the SIP layer.
• Non-Serving - indicates that a SIP PH is not performing the
signaling role but can take over the signaling role when needed.
• Unavailable - indicates that a SIP PH cannot perform any
signaling activities and cannot take over the signaling role if the
serving SIP PH fails.
Table 2-5, “Service Selection State” (2-33) illustrates the valid service
selection states allowed based on the status of the PHE2.
Table 2-5 Service Selection State
SERVICE SELECTION STATE PHE2 STATUS
SERVING ACTIVE
NON-SERVING ACTIVE
UNAVAILABLE OOS
UNAVAILABLE DEGRADED
The following conditions cause the SIP PH to transition to the
unavailable service selection state:
• SM full initialization,
• PH full initialization,
• SIP PH out of service (OOS),
• Ethernet OOS, and
• PSU2 failures.
When a SIP PH transitions from the service selection state of serving
or non-serving to the unavailable state due to a non-manual request, a
major alarm is reported.
Hardware View
Architecture
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-33
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