21. 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 a 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.
24. The SIP terminal process passes notification to the ISUP terminal
process. An ISUP ANM message is formulated 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.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-31
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