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Developing a Cross Platform IMS Client using the JAIN SIP Applet Phone

Developing a Cross Platform IMS Client using the JAIN SIP Applet Phone. Muswera Walter Supervisor: Prof Alfredo Terzoli. Introduction. There has been a growing interest in the adoption of the IP Multimedia Subsystem (IMS) by industry and research institutes.

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Developing a Cross Platform IMS Client using the JAIN SIP Applet Phone

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  1. Developing a Cross Platform IMS Client using the JAIN SIP Applet Phone Muswera Walter Supervisor: Prof Alfredo Terzoli

  2. Introduction • There has been a growing interest in the adoption of the IP Multimedia Subsystem (IMS) by industry and research institutes. • This has resulted in the establishment of IMS testbeds for developing and deploying IMS services. • Client applications used for testing and consuming services within these testbeds are important for the overall success of the developed services. • Client applications available today often support a limited set of basic services

  3. Convergence Research Group (CRG) Testbed

  4. Problem Statement • Several free open and closed source clients are currently being used by the CRG developers such as: • IMS Communicator • UCT IMS Client • Mercuro • No single client is available that has all the required features to test the applications being developed. • Most clients: • can only be used on specific platforms • support a limited range of video and audio codecs • Testing becomes difficult since developers have to find workarounds.

  5. Main Objective • Provide a unified client for application testing to researchers in the CRG that is: • flexible and easy to extend • cross-platform for easy deployment • IMS and SIP compliant

  6. JAIN SIP Applet Phone (JSAP) • JSAP is an open source project which is currently being managed by one of the CRG team members. • It has a mature code base and possesses some of the features required for application testing such as: • voice • text Instant Messaging (IM) • JSAP supports basic SIP signaling using the JAIN SIP API: • registration • session setup • It uses JMF as its media API .

  7. JSAP Limitations • JSAP only supports ordinary SIP signaling and session setup. • Video implementation in the JSAP is not fully functional: • live video capture is a problem in with JMF Linux • JMF lacks support of some of the new major codecs. • Presence in JSAP is implemented in a peer to peer manner. • Lacks support for XCAP.

  8. Sub Goals • Modify JSAP to support the core IMS functionality: • IMS registration • IMS session setup • Preserve current SIP support in JSAP: • IMS functionality is built on top of ordinary SIP functionality • Complete replacement of the media API used in JSAP: • problems with JMF

  9. Implementation • Extensive assessment of the JSAP was carried out before replacement of the media library and addition IMS support could be done. • The assessment involved carrying out systematic experiments such as: • tracing of messages sent by JSAP using network analysis tools to check their sequencing and well formedness • reverse engineering to find out the relationship among the various classes • discussing with some of the original developers of JSAP. • Having gone through the aforementioned processes a structure of JSAP was drawn up.

  10. Implementation - Derived JSAP Architecture

  11. Implementation – Integration of IMS Registration • JSAP only supports ordinary SIP registration. • IMS specific headers needed to be added on top of SIP headers to make the client IMS compatible. • In summary the process involved: • identifying the classes which needed to be modified to add IMS support • adding helper classes for populating IMS specific parameters • optimising or replacing some existing classes with ones that allow the support of IMS • adding XML support to allow the populating of IMS/SIP attributes and to allow persistence

  12. IMS Registration

  13. Implementation - Integration of IMS Session Setup • JSAP only supports basicSIP session setup. • Tested the client for interoperability with otherSIP and IMS clients: • Twinkle • Mercuro • Test scenarios were based on end to end system testing: • higher level functionality rather than specific protocol requirements

  14. SIP Session Setup

  15. IMS Session Setup

  16. Implementation • Bugs that have been identified in the JSAP have been cleaned: • unhandled server responses • client requests user credentials when re-registration has expired • replacement of deprecated methods • Duration for which user registration credentials are valid. • XML support for loading and storing IMS/SIP parameters • persistence of user configurations • will also be used to keep a list of supported codecs

  17. Registration Interfaces

  18. Call Interface

  19. Current Work – Integration of gstreamer-java media API • An investigation of alternative open source media APIs to the JMF was carried out • Among the projects investigated were a variety of implementations building on top of JMF such as FMJ • Gstreamer-java was chosen due to the following factors: • it supports most major codecs • it is still under active development • these java bindings are portable across operating systems • Testing functionality of new media API

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