Network View
....................................................................................................................................................................................................................................
Overview
The 5ESS
®
switch interfaces to internet protocol (IP) packet networks
using integrated packet trunking. SIP is a packet call signaling
protocol that offers a means to inter-operate with packet trunking
interfaces between network elements. SIP signaling uses the packet
switch unit model 2 (PSU2) to establish calls on the optical interface
unit-internet protocol (OIU-IP) integrated gateway.
IP Backbone
SIP for packet trunking and its related features provide the
functionality that allows the 5ESS
®
switch to interface to an IP
network. The signaling network, which uses session initiation protocol
(SIP), and bearer network can be located on distinct physical
networks, on one common network, or on distinct logical networks
Figure 2-1 IP Backbone
PSTN
5ESS Switch
®
5ESS Switch
®
5ESS Switch
®
IP Network
Telephone Application
Server (TAS)
Signaling Path
Bearer Path
POTS Subscriber
ISDN Subscriber
IP Subscriber
Architecture
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235-200-118
Issue 3.02B, March 2007
Lucent Technologies
2-3
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