IP telephony Columbia Internet RealTime Laboratory Department of
IP telephony @ Columbia Internet Real-Time Laboratory Department of Computer Science Columbia University Sep 25, 2003 Cinema/demo
Overview n Multimedia communication n Multi-devices n n Audio, video, text, screen sharing, … PSTN interworking, IVR, … IP-phone, telephone, X 10, Ncast, … Collaboration n Voicemail, discussion forum, … Sep 25, 2003 Cinema/demo 2
Point to point call sip: wenyu@cs. columbia. edu +1 212 9397040 Telephone subscriber IP endpoint Telephone network SIP/PSTN gateway SIP server sip: 7141@cs. columbia. edu SIP “forking” proxy Sep 25, 2003 Cinema/demo 3
Multimedia conferencing Telephone 7040 Department PBX IP phones (cisco, grandstream) SIP/PSTN Gateway Video encoder sipconf Conference server SQL database Web server Web based configuration Soft phones (sipc, jsipc, messenger) siph 323: SIP-H. 323 translator Sep 25, 2003 Cinema/demo H. 323 Net. Meeting 4
Non real-time collaboration n Voicemail n n n Answering machine on no-answer or busy Auto-attendant to access Inbox Web interface n Configuration and profile Sep 25, 2003 Cinema/demo 5
Messaging and device control X 10 device SIP lamp DO sip: stereo@cs. columbia. edu SIP/2. 0 …. . <Control> <Action>tune AM 103 K</Action> </Control> Sep 25, 2003 MESSAGE sip: lamp@cs. columbia. edu SIP/2. 0 …. . turn on Cinema/demo 6
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 Sep 25, 2003 Cinema/demo 9
Summary n n SIP-based architecture Heterogeneous endpoints n n n Advanced services n n Telephone, SIP phone, H. 323 Devices like lamp, video encoder Programmable call routing, voice mail, interactive voice response Multimedia collaboration n n Synchronous: conference, IM Offline: discussion board, voicemail, file sharing Sep 25, 2003 Cinema/demo 12
- Slides: 8