Converged Application Development James Steadman

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Converged Application DevelopmentJames Steadman
Chief Solutions Architect
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Scope

• SIP Servlets
• Converged applications
• Converged SIP and HTTP Servlet containers
• Convergence through decoupled containers

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SIP Servlets

• A SIP Servlet is a Java based application
  component that is managed by a container and
  performs SIP Signalling
• Rapid development and deployment
• Provides industry accepted standardisation in SIP
  Application Development

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SIP Servlets 2

• SIP Servlets structure is derived from Java
  Servlets
• Widely used proven model for developing web
  applications
• Familiar to ISV development community

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Converged Applications

• Converged applications
• A converged application is one that spans
  multiple protocols, for example, web, telephony,
  and presence.
• Goal support easier development of SIP
  applications that interact with other protocols.
• Click to Call

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Comparison of SIP and HTTP Servlets

• Differences of SIP and Java Servlets
• Java Servlets are synchronous
• SIP Servlets are asynchronous
• SIP Servlets provide proxying
• SIP Servlets allow forking
• SIP Servlets can behave as UACs
• Result of the divergence
• Redundant HTTP methods and concepts remain in SIP
  servlet API

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Converged Containers

• Spec suggests providing converged HTTP and SIP
  Servlet container.
• Issues with tightly coupled HTTP and SIP Servlet
  containers
• HTTP and SIP Servlets have different behaviours
• HTTP predominantly concerned with presentation
• SIP is a session signalling protocol
• Loss of flexibility to converge with other event
  sources/protocols.

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Decoupled Containers

• Converged applications but decoupled containers.

RMI
HTTP Servlet Container
EJB Container
HTTP
SIP Servlet Container
SIP
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Advantages and limitations of decoupling

• Advantages
• Decoupling allows better design for the converged
  applications.
• Exploits the ability for SIP Servlet applications
  to be converged with other event sources.
• Limitations
• Needs evolution of development and deployment
  tools to ease the production of application.
• Already addressed in J2EE world.

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Decoupled container progress

• Generic event framework concept proposed as an
  extension to the SIP Servlet specification.
• Draft APIs provided for review
• http//www.ubiquity.net/sip_servlet_extension.php
• Concept still being developed and refined.

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Summary

• SIP Servlets
• A key development in the production of SIP
  enabled applications.
• Converged applications
• A desirable and powerful concept
• Converged HTTP and SIP servlet container
• A limited approach to achieving the aim of
  converged applications
• Converged application using decoupled containers.
  
• Allows better converged application design and
  provides more flexibility and reusability

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