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IP telephony @ Columbia

Explore the innovative IP telephony and multimedia communication technologies developed at the Department of Computer Science, Columbia University. This includes PSTN interworking, collaboration tools, SIP/H.323 translation, and advanced services like voicemail and interactive voice response. Discover the wide range of applications and benefits of this cutting-edge research.

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IP telephony @ Columbia

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  1. IP telephony @ Columbia Internet Real-Time Laboratory Department of Computer Science Columbia University

  2. Overview • Multimedia communication • Audio, video, text, screen sharing, … • PSTN interworking, IVR, … • Multi-devices • IP-phone, telephone, X10, Ncast, … • Collaboration • Voicemail, discussion forum, … Cinema/demo

  3. SIP “forking” proxy Point to point call sip:wenyu@cs.columbia.edu +1 212 9397040 IP endpoint Telephone network Telephone subscriber SIP/PSTN gateway SIP server sip:7141@cs.columbia.edu Cinema/demo

  4. Web server siph323: SIP-H.323 translator H.323 NetMeeting Multimedia conferencing Department PBX SIP/PSTN Gateway Video encoder Telephone 7040 IP phones (cisco, grandstream) sipconf Conference server SQL database Web based configuration Soft phones (sipc, jsipc, messenger) Cinema/demo

  5. Non real-time collaboration • Voicemail • Answering machine on no-answer or busy • Auto-attendant to access Inbox • Web interface • Configuration and profile Cinema/demo

  6. Messaging and device control X10 device SIP lamp DO sip:stereo@cs.columbia.edu SIP/2.0 ….. <Control> <Action>tune AM 103K</Action> </Control> MESSAGE sip:lamp@cs.columbia.edu SIP/2.0 ….. turn on Cinema/demo

  7. Location information handling Location information handling Talk to Xiaotao • Over the phone • Go to his place and • talk face to face • IM and meet him • in conference room Cinema/demo

  8. Summary • SIP-based architecture • Heterogeneous endpoints • Telephone, SIP phone, H.323 • Devices like lamp, video encoder • Advanced services • Programmable call routing, voice mail, interactive voice response • Multimedia collaboration • Synchronous: conference, IM • Offline: discussion board, voicemail, file sharing Cinema/demo

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