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CGU SIP VC Client: Design, Architecture & Demo

Explore the design and architecture of a Session Initiation Protocol (SIP) client and view a live demo showcasing its features. Learn about user registration, audio/video codecs, future directions, and more.

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CGU SIP VC Client: Design, Architecture & Demo

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  1. CGU SIP VC Client: Design, Architecture & Demo Dr. Samir Chatterjee Network Convergence Laboratory School of Information Science Claremont Graduate University Claremont, CA 91711 909-607-4651; sip:samir.chatterjee@cgu.edu

  2. Acknowledgments • Network Convergence Lab at CGU • Bengisu Tulu, Tarun Abhichandani, Haiqing Li, Jongbok Byun • National Science Foundation Grant (NMI Proposal 0222710) • Internet2 and ViDe Net Folks • Jill Gemmill (UAB, Birmingham) • Tyler Johnson (UNC, Chapel Hill) • Egon Verharen (SURFNET) • Ken Klingenstein (Internet2) • Dynamicsoft Inc (SIP partner)

  3. SIP (The IETF Standard) • Session Initiation Protocol is a signaling standard approved by IETF for real-time multimedia session establishment. • Sessions can be voice, video or instant messaging and is described by SDP. • Basic components: • User Agent (UA): works on behalf of users to set up calls • Proxy Servers (PS): keeps track of location of end-points • Registrar: Each UA registers to inform current location and preferred reachability information • SIP also has been approved for 3G wireless systems.

  4. SIP Operation LS LS Cgu.edu Proxy/registrar Unc.edu Proxy/registrar Sip:samir@cgu.edu Sip:alice@unc.edu REGISTER sip:registrar.cgu.edu SIP/2.0 Via: SIP/2.0/UDP samirspc.cgu.edu:5060;branch=z9hG4bKnashds7 Max-Forwards: 70 To: Samir <sip:samir@cgu.edu> From: Samir <sip:samir@cgu.edu>;tag=456248 Call-ID: 843817637684230@998sdasdh09 CSeq: 1826 REGISTER Contact: <sip:samir@192.0.2.4> Expires: 7200 Content-Length: 0 INVITE sip:Samir@cgu.edu SIP/2.0 Via: SIP/2.0/UDP pc33.atlanta.com;branch=z9hG4bKnashds8 Max-Forwards: 70 To: Samir <sip:samir@cgu.edu> From: Alice <sip:alice@unc.edu>;tag=1928301774 Call-ID: a84b4c76e66710 CSeq: 314159 INVITE Contact: <sip:alice@pc33.unc.edu> Content-Type: application/sdp Content-Length: 142

  5. Dynamicsoft SIP Stack Architecture SDP Message API SIP Message API High-level API Optional for low- Level, Mid-level And JAIN API Mid-level API State Machine JAIN API Low-level API State Machine DsUtil Library Source: Dynamicsoft SIP User Agent Manual Java Version 5.4 and C++ Version 5.2

  6. JMF Architecture Source: Java Media Framework API Guide, November 1999. TM: Sun Microsystems Inc.

  7. CGU SIPClient v1.1 Architecture • We use two packages • Utils package maintains existing SIP calls • CGU Client package that handles SIP calls, media and GUI part • These packages interact with Dynamcisoft SIP libraries, SDP and JMF for media handling.

  8. Audio/Video Codecs • Audio • G.723 • GSM • DVI • law • Video • H.261 • H.263 • JPEG

  9. User Registration Process http://ncl.cgu.edu/sipclient/index.php

  10. CGUsipClientv1.1 Demo • Bengisu (in DC) calls Liha (in Claremont) • Audio connection established • Video connection established • Liha calls Bengisu • CallerID explained • Bengisu calls Liha • Liha redirects to Nadim • Bengisu receives redirect and calls Nadim • Redirect to a web page • Show ED and commobject

  11. Future Directions • Client’s Next Release • Authentication with password stored in LDAP • Enabling Firewall/NAT support • Plan to use STUN, UPnP • Click to dial from commObject directory • Getting away from commercial SIP • Client built on open source (Vovida), open source proxy • Performance Enhancements • Load measurements • Media performance • Use wavelet codecs • Test against SIP-based MCUs • Further Integration with LDAP • Federated Security • Role-based authorization using OpenSAML • Experimenting with digital certs (KX.509)

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