17. The SIP PH receives a 200 OK (UPDATE) message from the
TPS. This message acknowledges that the TPS received the
UPDATE message.
18. 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.
19. The SIP PH receives a 180 RINGING message from the TPS.
The message informs the OPS that the called party is available
and that ringing has been applied.
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.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
3-30
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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