10. 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.
11. The SIP terminal process forwards the IP address and port
number of the TPS bearer resource to the bearer terminal process.
12. The bearer terminal process forwards the IP address and port
number of the TPS bearer resource to the selected OFI.
13. The selected OFI acknowledges that it received the information
and opens the selected port.
14. The SIP terminal process formulates an UPDATE message and
forwards it to the SIP PH in the SIP GSM. This message is in a
compact, internal SIP format. The UPDATE message notifies the
TPS that the bearer path is now available.
15. The SIP PH expands the UPDATE message to standard, external
SIP format, adds the appropriate SCTP and IP headers, and
forwards it to TPS via the IP signaling network.
16. The OPS waits for the TPS to respond.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-29
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