6. The bearer terminal process takes steps to tear down the call by
closing the port on the OFI and releasing used timeslots.
7. The SIP PH receives a 200 OK (BYE)message from the TPS.
The message informs the OPS that it received the BYE message.
8. 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.
9. The SIP terminal process terminates any remaining processes
dedicated to the call.
10. Call flow is complete
Call Tear Down at
Terminating Packet Switch
(SIP to ISUP)
This section takes a closer look at the processing and messaging
completed by the TPS when acting as a gateway between the PSTN
and an IP network .
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
3-38
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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