3. The SIP terminal process performs digit analysis to determine if
the call should be routed to a line or a trunk. The SIP terminal
process determines the call should be routed to an ISUP trunk.
Additionally, the SIP terminal process determines that the call
from the OPS must arrive at a bearer resource so it requests that
the CMP select a bearer resource for the call.
4. The CMP:
• determines that the call arrives at a SIP packet group,
• selects a switching module for the bearer terminal process.
The determined information as well as the IP address and port
number of the OPS bearer resource are then forwarded to the
selected IP bearer switching module.
5. The bearer terminal process selects an OFI and a port for the
call. The bearer terminal process request that the OFI open the
selected port for this transaction. Finally, the IP address and port
number of the selected resource are forwarded to the SIP terminal
process.
Detailed Call Scenarios - SIP Base
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-33
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