SIP Proxy Server

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Signaling Gateway
Tablet PC
IP
PBX
Analog Telephone
Bridge
Call Manager
IP Telephony Router
SwitchVoice-Enabled
AccessGateway
BroadbandRouter
SIP Proxy Server
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Figure 7-1 Softswitch Architecture Components
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Figure 7-3 PC to PC and PC to phone
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Figure 7-4 IP phone on an IP network
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Figure 7-5 SOHO gateways in a VOIP network
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Figure 7-6 Enterprise gateways on a VoIP network
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Figure 7-7 VoIP gateways in carrier-grade
applications
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Figure 7-8 IP PBX also known as soft PBX
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Figure 7-9 IP Centrex using a Class 5 switch and
GR-303 interface
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Figure 7-10 IP Centrex with Softswitch
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Figure 7-11 Architecture of Class 4 switches with
VoIP gateways
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Figure 7-12 Class 4 replacement Softswitch
solution Note the absence of Class 4 TDM switches
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Figure 7-13 Class 5 replacement Softswitch
solution
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Figure 7-14 Legacy networks separate voice and
data networks
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Figure 7-15 Converging networks a mix of
circuit- and packet-switched networks and
technologies
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Figure 7-16 A converged network is one network
for voice and data.
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Figure 7-17 Local Access Softswitch-Based
Architecture
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Developing Softswitches
As the new public network comes to fruition, the
end is in sight for the traditional proprietary
PSTN circuit switch. The functionality of the
traditional circuit switch has been delegated to
separate nodes including the softswitch, media
gateway, signaling server, and application
server. Defined by the International Softswitch
Consortium as a device that has call control,
signaling, and feature creation/delivery
capabilities, the softswitch forms the foundation
of the new public network infrastructure.
However, in an environment of resource
constraints, TEMs (telecom equipment
manufacturers) developing these softswitch
applications are facing increasing demands on
time-to-market and cost. The business problem for
TEMs is how to focus on developing robust and
reliable softswitch applications while also
addressing the complex and work-intensive areas
of hardware design, high availability,
integration, and management at the platform
level.