Network Architecture
....................................................................................................................................................................................................................................
The 5ESS
®
switch can function as either an OPS or TPS in different
network architectures:
•
Packet Trunking: The 5ESS
®
switch in the PSTN, connected to
another SIP-enabled switch in the PSTN by means of SIP packet
trunking (call originates and terminates in PSTN, but traverses
the IP network between the PSTN endpoints). This network
architecture is illustrated in Figure 3-1, “Packet Trunking” (3-3).
• PSTN Gateway: The 5ESS
®
switch in the PSTN connected to an
IP Telephone Application Server (TAS) TPS in the IP network,
with the 5ESS
®
switch serving as a PSTN Gateway for calls
originating in the PSTN and terminating in the IP network, or
originating in the IP network and terminating in the PSTN. This
network architecture is illustrated in Figure 3-2, “PSTN
Gateway” (3-4).
Figure 3-1 Packet Trunking
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
Call Flow
....................................................................................................................................................................................................................................
235-200-118
Issue 3.02B, March 2007
Lucent Technologies
3-3
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