12. The SIP PH builds the 200 OK (UPDATE) message in standard,
external SIP format, adds the appropriate SCTP and IP headers,
and forwards it to OPS via the IP signaling network.
13. The SIP terminal process passes the updated call state to the
ISUP terminal process. An ISUP COT message is formulated and
forwarded to the ST PH in the SS7 GSM. Finally, the message is
sent to the terminating switch.
14. An ISUP ACM message arrives at the TPS on a signaling data
link (SDL). The message is sent from the trunk peripheral
terminating the SDL to the ST PH in the SS7 GSM via nailed up
timeslots.
15. The ST PH examine the message and forward it to the ISUP
terminal process. The message is then forwarded to the SIP
terminal process.
16. The SIP terminal process develops a 180 RINGING message.
This message is in a compact, internal SIP format. The SIP
message is forwarded to the SIP PH in the SIP GSM.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-35
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