The serving SIP PH:
• initiates its local SCTP endpoint and the associations provisioned
on that endpoint when SCTP transport is used,
• initiates the SIP interface to UDP paths provisioned on the
processor group when UDP transport is used,
• provides the non-serving SIP PH with stable call data to be
preserved in case a failure occurs with the serving SIP PH,
• provides the CP SMP with stable call data to address cases that
impact both SIP PHs,
• supports address resolution protocol (ARP) functionality, and
• initiates IP pings to confirm IP connectivity.
The non-serving SIP PH:
• Receives stable call data from the serving SIP PH over the PSU2
packet bus interface,
• Does not send or receive packets over the Ethernet interface,
• Is able to detect and report Ethernet link failures.
Figure 2-17, “SIP PH Functionality” (2-31) depicts how the serving
SIP PH saves the stable call data.
Figure 2-17 SIP PH Functionality
PSU2
GQPH
SIP PH
D
2
F
CF2
Serving
Non-Serving
CIB
CIB
PIB
PHDB
CB
PB
P
2
F
SIP PH
CB
PB
CB
PB
LLE2
LLE2
RR
IP Network
GSM - 2000
TSI
PCT
To CP
SMP
Primary
NCT2 Link
to CM
Hardware View
Architecture
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-31
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