24. The SIP terminal process detects no ISUP MIME. A check is
performed to verify that encapsulated ISUP is not expected,
processing continues and passes notification to the ISUP terminal
process. A default ISUP ANM message (without any parameters)
is created and forwarded to the ST PH in the SS7 GSM. Finally,
the message is sent to the originating switch.
25. The call path through the switch is established and remains
available until the call is terminated.
Call Setup at TPS - No
ISUP
This section takes a closer look at the processing and messaging
performed by the TPS when acting as a gateway between an IP
network and the PSTN.
1. An INVITE message arrives at, and is accepted by the SIP PH in
the SIP GSM. This message includes:
• IP address of OPS signaling point
• IP address of TPS signaling point
Figure 3-22 Call Setup at TPS - Steps 1-6
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
2
INVITE
1
4
5
6
INVITE
Message
Message
In a standard, external format
In a compact, internal format
3
SIP without Encapsulated ISUP - Detailed
Call Scenario
Call Flow
....................................................................................................................................................................................................................................
3-56
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
To Next Page
Loading...
Need help?
General
