Lucent Technologies 5ESS - Page 91

- TRANSIT NETWORK SELECTION=BASIC,
- REDIRECTING INFO=DIVERSION,
- ORIGINATING LINE INFO=FROM,
- HOP COUNTER=MAXFORWARD, and
- CARRIER SELECTION=BASIC.
• PSTN to SIP mapping rules do not apply to this example, they
only apply to OPS scenarios.
Figure 3-7 5ESS
®
Switch PSTN Gateway TPS and TAS OPS
Message Flow
Lucent O
5E-XC
TM
SIP
INVITE {SDP}
IAM
100 TRYING
Audible Ringing Provided from Termination
ANM
200 OK (BYE)
Call in Talking State
5ESS Switch
PSTN Gateway
TPS
(R)
ACM
1
2
3
8
Originating IP
TAS OPS
Terminating
PSTN Switch
180 RINGING {SDP}
BYE
REL
PRACK
Called Party
goes off-hook
6
200 OK (INVITE)
ACK
7
200 OK (PRACK)
SUS
IP subscriber
call is forwarded
to PSTN
4
5
Called Party
goes on-hook
RLC
Message Flows
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-21