Lucent Technologies 5ESS User Manual

between two switches using the pair of dynamically allocated packet
interfaces that acts as a virtual trunk.
Public Switched
Telephone Network (PSTN)
Gateway
The PSTN Gateway application allows phone calls to be setup
between PSTN subscribers that terminate to a 5ESS
®
switch and IP
subscribers that terminate to a Telephone Application Server (TAS).
The PSTN Gateway sits between the IP network (using SIP signaling)
and PSTN network (using ISUP signaling). Figure 2-6, “PSTN
Gateway” (2-8) illustrates how the PSTN gateway fits into the
network. The PSTN Gateway performs the interworking between SIP
and ISUP protocols.
Figure 2-6 PSTN Gateway
PSTN
5ESS Switch
®
5ESS Switch
PSTN Gateway
®
IP Network
Telephone Application
Server (TAS)
Signaling Path
Bearer Path
POTS Subscriber
ISDN Subscriber
IP Subscriber
Network View
Architecture
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2-8
Lucent Technologies 235-200-118
Issue 3.02B, March 2007

Lucent Technologies 5ESS Specifications

General

Brand	Lucent Technologies
Model	5ESS
Category	Switch
Language	English