14. The SIP terminal process creates an UPDATE message and
forwards it to the SIP PH in the SIP GSM. This message is in a
compact, internal SIP format. The UPDATE message notifies the
TPS that the bearer path is now available.
15. The SIP PH expands the UPDATE message to standard, external
SIP format, adds the appropriate SCTP and IP headers, and
forwards it to TPS via the IP signaling network.
16. The OPS waits for the TPS to respond.
17. The SIP PH receives and accepts the 200 OK (UPDATE)
message from the TPS. This message acknowledges that the TPS
received the UPDATE message.
18. 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.
19. The SIP PH receives a 180 RINGING message from the TPS.
The message informs the OPS that the called party is available
and that ringing has been applied.
Figure 3-20 Call Setup at OPS - Steps 18-21
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
20
180 RING
19
18
21
180 RING
OK UPDATE
ISUP ACM
ISUP ACM
21
SIP without Encapsulated ISUP - Detailed
Call Scenario
Call Flow
....................................................................................................................................................................................................................................
3-54
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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