Figure 3-3, “Network Elements” (3-6), illustrates how the different
network elements interface to each other.
Originating Switch
The originating switch terminates the calling party and provides an
interface to the PSTN.
Originating Packet Switch (OPS)
The OPS serves as a gateway between the PSTN and an IP network.
At the OPS, the incoming circuit call is routed out of the office to an
IP bearer resource using SIP. Any circuit peripheral can be used for
the incoming call.
Three SMP processes are involved in a SIP call:
• the SMP process for the circuit call (ISUP terminal process)
• the SMP process for the SIP call processing SM (SIP terminal
process), and
• the SMP process with the OFI-IP for the bearer connection
(bearer terminal process).
Figure 3-3 Network Elements
IP Bearer Network
OC-3cOC-3c
IP Signaling Network
Edge RouterEdge Router
Ethernet Ethernet
OPS
PSU2
OIU-IP
PSU2
OIU-IP
TPS
DNU-S DNU-S
Edge Router Edge Router
PSTN
Originating Switch
PSTN
Terminating Switch
Network Architecture
Call Flow
....................................................................................................................................................................................................................................
3-6
Lucent Technologies 235-200-118
Issue 3.02B, March 2007
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