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SIP as API: International Softswitch Consortium s Architecture for Enhanced Services in a Softswitch Network
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The International Softswitch Consortium (see www.softswitch.org), an industry group of softswitch vendors and service providers, has proposed an architecture for the delivery of features on softswitch networks. Although this industry is still in its infancy, the ISC proposes certain guidelines aimed at promoting open standards and open architecture. The following section outlines the architecture for enhanced services proposed by the ISC. Two components, the application server and the media server, are introduced into the architecture to provide support for enhanced service logic, management functions, and specialized media resources. Application servers are intended to host a variety of enhanced services. An application server provides a framework for the execution and management of enhanced services. These services make use of the call control functions provided by the underlying infrastructure as well as enabling the integration of messaging, presence, and web services (see Figure 10-6).
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Figure 10-6 The functions of application and media servers (Source: International Softswitch Consortium)
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MEDIA SERVER FUNCTION
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Features and Applications: It s the Infrastructure, Stupid!
Features and Applications: It s the Infrastructure, Stupid!
Media Servers
A media server provides specialized resources such as Interactive Voice Response (IVR), conferencing, and facsimile functions. Media servers and application servers are independent and can be deployed on separate physical platforms or on the same platform. An application server can utilize resources on a media server for enhanced services, which require access to the media stream.
Application Servers
APIs, as described earlier in this chapter, are hosted on the application server, providing access to underlying service and switching functions. Using these APIs, services can be easily developed and deployed. In addition, traditional telephony call models and Transaction Capabilities Application Part/Intelligent Network Application Part (TCAP/INAP) protocols can potentially reside on an application server, providing access to standard AIN/IN telephony services.
Architecture
A functional view of the next-generation packet telephony architecture is shown in Figure 10-7. An example of SIP control flow between application server and call control functions is displayed in Figure 10-8. The function of each entity in Figure 10-8 is described in Table 10-2. The introduction of an application server to the packet architecture provides for platforms specifically designed for enhanced services. By using SIP as the application interface between a call control entity (softswitch) and an application server, a common, standard protocol can be used for communication between all call control and service execution entities. These new services can be deployed quickly with little or no impact on network rollouts. An application server utilizes an SIP interface, which provides access to the signaling aspects of a call, while a media server utilizes a Real-Time Protocol (RTP) interface, which provides access to the media stream. Services on application servers make use of the resources provided by media servers. With an application server and a media server, services that require access to both the signaling path and media stream can be provided.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
Figure 10-7 Softswitch-enhanced service architecture (Source: International Softswitch Consortium)
Call Control Function SIP Call Control Function SIP Application Server Function SIP
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Application Server Function
Signaling Gateway Function
Media Gateway Function RTP
Media Server Function
Figure 10-8 SIP control flow between application server and call control functions
Application Server Function
I N V I T E
3 X X R E D I R E C T A C K I N V I T E 2 0 0 O K
Application Server Function
A C K R E F E R 2 0 0 O K B Y E 2 0 0 O K
Application Server Function
I N V I T E 2 0 0 O K
Application Server Function
I N V I T E 2 0 0 O K
Call Control Function
Call Control Function
Call Control Function
Call Control Function
Enhanced services reside on application servers, which provide an environment for the execution, management, and creation of these services. Service APIs, as well as AIN/IN call models, may reside on the application server. To support converged services, an application server may also utilize
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Features and Applications: It s the Infrastructure, Stupid!
Features and Applications: It s the Infrastructure, Stupid!
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