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

2. Sep 25, 2003 Cinema/demo2 Overview Multimedia communication Audio, video, text, screen sharing, … PSTN interworking, IVR, … Multi-devices IP-phone, telephone, X10, Ncast, … Collaboration Voicemail, discussion forum, …

3. Sep 25, 2003 Cinema/demo3 Point to point call Telephone network SIP/PSTN gateway SIP server IP endpoint Telephone subscriber +1 212 9397040 sip:wenyu@cs.columbia.edu sip:7141@cs.columbia.edu SIP “forking” proxy

4. Sep 25, 2003 Cinema/demo4 Multimedia conferencing Telephone 7040 SIP/PSTN Gateway Department PBX Web based configuration Web server SQL database sipconf Conference server NetMeeting H.323 siph323: SIP-H.323 translator Video encoder IP phones (cisco, grandstream) Soft phones (sipc, jsipc, messenger)

5. Sep 25, 2003 Cinema/demo5 Non real-time collaboration Voicemail Answering machine on no-answer or busy Auto-attendant to access Inbox Web interface Configuration and profile

6. Sep 25, 2003 Cinema/demo6 Messaging and device control DO sip:stereo@cs.columbia.edu SIP/2.0 ….. tune AM 103K lamp X10 device SIP MESSAGE sip:lamp@cs.columbia.edu SIP/2.0 ….. turn on

7. Sep 25, 2003 Cinema/demo7 sipd Ubiquitous computing

8. Sep 25, 2003 Cinema/demo8 Emergency service E-911 calls Location of the caller Audio, video, text Notification

9. Sep 25, 2003 Cinema/demo9 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 Location information handling

10. Sep 25, 2003 Cinema/demo10 Location sensing SUBSCRIBE to my location PUBLISH presence status NOTIFY myself and others’ locations by Jamey from HP Location sensing

11. Sep 25, 2003 Cinema/demo11 More location handling

12. Sep 25, 2003 Cinema/demo12 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