16. The ST PH examines the message and forwards it to the ISUP
terminal process. The message is then forwarded to the SIP
terminal process.
17. The SIP terminal process develops a 180 RINGING message. A
check is made to determine whether encapsulated ISUP is
required. In this example, encapsulated ISUP is not required,
therefore the terminal process discards the ISUP ACM MIME.
This message is in a compact, internal SIP format. The SIP
message is forwarded to the SIP PH in the SIP GSM.
18. The SIP PH receives and accepts the message with no ISUP
MIME and expands the 180 RINGING message to standard,
external SIP format, adds the appropriate SCTP and IP headers,
and forwards it to OPS via the IP signaling network.
19. An ISUP ANM message arrives at the TPS on a signaling data
link (SDL). The message is sent from the trunk peripheral
terminating the SDL to the ST PH in the SS7 GSM via nailed up
timeslots.
Figure 3-25 Call Setup at TPS - Steps 19-23
OIU
SDL
Ethernet
IP Network
OC-3c
IP Network
OC-3c
SONET
Originating
Packet
Switch
(OPS)
Terminating Packet Switch (TPS)
AM
NLI
PSU
DLTU
SM-2000
TSI
SMP
NLI
SM-2000
SMP
PSU
GQPH
SIP-PH
PSUCOM
TSI
NLI
SM-2000
SMP
TSI
OFI-IP
OFI-IP
BRR TP
SIP TP
NLI
DNUS
SM-2000
TSI
SMP
ISUP TP
CM
CMP
Terminating
Switch
PSTN
CCS-SS7
22
Message
Message
In a standard, external format
In a compact, internal format
ISUP ANM
19
20
20
21
OK INVITE
OK INVITE
SIP without Encapsulated ISUP - Detailed
Call Scenario
Call Flow
....................................................................................................................................................................................................................................
3-60
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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