9. The SIP PH receives and accepts the 183 SESSION PROGRESS
message from the TPS. The message includes the IP address and
port number of the TPS bearer resource.
10. The SIP PH strips the SCTP and IP headers, compacts the
message to the internal SIP format, and forwards the message to
the SIP terminal process.
11. The SIP terminal process receives the 183 SESSION PROGRESS
message and does not detect an ISUP MIME. A check is
performed to verify that Encapsulated ISUP is not expected and
processing continues. The SIP terminal process also forwards the
IP address and port number of the TPS bearer resource to the
bearer terminal process.
12. The bearer terminal process forwards the IP address and port
number of the TPS bearer resource to the selected OFI.
13. The selected OFI acknowledges that it received the information
and opens the selected port.
Figure 3-19 Call Setup at OPS - Steps 10-17
Originating Packet Switch (OPS)
Originating
Switch
AM
NLI
PSU
SDL
CCS-SS7
DLTU
SM-2000
TSI
SMP
NLI
Ethernet
SM-2000
SMP
PSU
GQPH
IP Network
SIP-PH
PSUCOM
TSI
OIU
NLI
OC-3c
IP Network
SM-2000
SMP
TSI
OFI-IP
OFI-IP
OC-3c
BRR TP
SIP TP
SONET
PSTN
NLI
DNUS
SM-2000
TSI
SMP
ISUP TP
CM
Terminating
Packet
Switch
(TPS)
CMP
Message
Message
In a standard, external format
In a compact, internal format
11
UPDATE
14
15
OK UPDATE
17
UPDATE
183
10
12,13
SIP without Encapsulated ISUP - Detailed
Call Scenario
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-53
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