Detailed Call Scenarios - SIP Base
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This section closely examines how SIP calls are processed within the
5ESS
®
switch.
There are several different switching module processor (SMP)
processes involved in the call. These processes include:
•
ISUP Terminal Process (ISUP TP): Formulates and interprets
ISUP messages. The switching module that hosts the ISUP
terminal process also hosts the ISUP trunk member that has been
assigned for the call.
•
SIP Terminal Process (SIP TP): Formulates and interprets SIP
messages in a compact, internal format. The SM-2000 that hosts
this process is called the SIP call processing switching module.
•
Bearer Terminal Process (BRR TP): Assigns and controls the
OFI for the call. The switching module that hosts the bearer
terminal process also hosts the packet group that has been
assigned for the call.
These processes can be provided by the same switching module, three
different switching modules, or a combination of two switching
modules.
The following detailed called scenarios are discussed:
• Call Setup at Originating Packet Switch
• Call Setup at Terminating Packet Switch
• Call Tear Down at Originating Packet Switch
• Call Tear Down at Terminating Packet Switch
Note: These call scenarios use PSU-SS7 signaling.
Call Flow
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3-26
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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