17. The SIP PH expands the 180 RINGING message to standard,
external SIP format, adds the appropriate SCTP and IP headers,
and forwards it to OPS via the IP signaling network.
18. An ISUP ANM 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.
19. The ST PH examine the message and forward it to the ISUP
terminal process. The message is then forwarded to the SIP
terminal process.
20. The SIP terminal process develops a 200 OK (INVITE) message.
This message is in a compact, internal SIP format. The SIP
message is forwarded to the SIP PH in the SIP GSM.
21. The SIP PH expands the 200 OK (INVITE) message to standard,
external SIP format, adds the appropriate SCTP and IP headers,
and forwards it to OPS via the IP signaling network.
22. The call path through the switch is established and remains
available until the call is terminated.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
3-36
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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