20. 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. The INVITE transaction timer is
stopped in the SIP terminal process.
21. The SIP terminal process detects no ISUP MIME. A check is
performed to verify that encapsulated ISUP is not expected, the
Automatic ACM timer is stopped and processing continues. The
SIP terminal process passes notification of ringing to the ISUP
terminal process. An ISUP ACM message is formulated and
forwarded to the ST PH in the SS7 GSM. Finally, the message is
sent to the originating switch.
22. The SIP PH receives and accepts the 200 OK (INVITE) message
from the TPS. The message informs the OPS that the called party
has gone off-hook.
23. 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.
Figure 3-21 Call Setup at OPS - Steps 22-25
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
23
OK INVITE
22
24
OK INVITE
ISUP ANM
ISUP ANM
24
SIP without Encapsulated ISUP - Detailed
Call Scenario
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-55
To Next Page
Loading...
Need help?
General
