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10
be assembled on the fly in a plug-and-play fashion, drastically reducing the time and effort to develop services.3
Application Programming Interfaces (APIs)
Features reside at the application layer in softswitch architecture. The interface between the call control layer and specific applications is the API. Writing and interfacing an application with the rest of the softswitch architecture occurs in the service creation environment. Those open standards include APIs known as Parlay, Java Advanced Intelligent Network (JAIN), Common Object Request Broker Architecture (CORBA), and Extensible Markup Language (XML). Figure 10-4 details the relationship of APIs in the service creation environment.
APIs and Services
To compete with the incumbent service providers, packet telephony service providers must be able to provide existing services while introducing advanced services quickly and inexpensively. By moving the responsibility
Figure 10-4 The relationship of APIs in the service creation environment
Service Creation Environment Application Server (Applications & Services)
Application Program Interface (SIP, JAIN, Parlay, CORBA)
Media Gateway Controller (Call Control & Switching)
3 Sun Microsystems. The JAIN APIs: Integrated Network APIs for the Java Platform. A white paper available at www.java.sun.com/products/jain, May 2002, pg. 7.
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Features and Applications: It s the Infrastructure, Stupid!
Features and Applications: It s the Infrastructure, Stupid!
for advanced services away from the call control entities, APIs resident on an application server, such as JAIN, Parlay, CORBA, Call Processing Language (CPL), Common Gateway Interface (CGI), and Servlets, provide packet telephony service providers with an environment where differentiating services can be deployed rapidly. The open (as opposed to proprietary) nature of these APIs enables services to be created, managed, and deployed without requiring new or upgraded network infrastructure functionality. One of the major advantages of using packet telephony and softswitch architecture is that the underlying transport protocol (IP) is also used for a variety of other services, including web access, email, presence, and instant messaging. Enhanced services in packet telephony networks will enable the integration of these services, bringing together telephony and Internet services. Application servers are required to interwork with a variety of nontelephony protocols and APIs in order to provide these services. Because of the complexity and overhead, service APIs reside on an application server to provide enhanced services processing. Services on an application server can provide the integration of traditional AIN/IN services with Internet services. The application server model provides an architecture for enhanced services within a pure packet-based network and within the business domain of the network provider. APIs such as Parlay, JAIN, and CORBA focus on hybrid networks and provide for services both inside and outside the network provider s business and technology domains. Third-party developer relationships are extremely important to softswitch vendors. Assuming media gateway ports become commoditized, softswitch vendors will need to distinguish themselves by offering the easy deployment of third-party applications. Service providers will value third-party developers, which can create the applications that will set carriers apart from their competitors.4 Firms exist now that own no switches or network and provide only application services to carriers. Open standards enable a carrier to shop the market for components that are more competitively priced than what one would find when buying proprietary components from the Class 4 vendor, for example. Parlay Parlay is a platform for Java technology-based enterprise application integration, development, and deployment. Its features and enterprise scalability combine to solve two key enterprise business challenges: integrating diverse types of data, applications, and client environments,
Pfalmer, Brandy. Will Softswitch Be the Heart of Next-Generation Networks Call State and Interoperability Issues Continue to Hamper Softswitch Beat. Sounding Board, October 1999, pg. 15.
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Features and Applications: It s the Infrastructure, Stupid!
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