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Transcript

  • 1. VoIP(oW) Applications for HomeCom http://ps.verkstad.net/Results/Talks/VoIP-HomeCom.ppt February, 2000
  • 2. Agenda
    • What is VoIP? Technologies, QoS Problems
    • Why is it interesting? Motivations
    • VoIP? Where?
    • Application Enablers
    • Service Architecture
    • Applications
    • Conclusions
  • 3. What is VoIP?
    • Voice over I nternet P rotocol
    C. Speech IP ... C. Speech ... C. Speech Medium: Ethernet, ATM, GSM, GPRS, ... IP Transport Protocol Uncompressed Uncompressed C. Speech IP ... C. Speech ... C. Speech
  • 4. What is VoIP? IP Application Signaling (Wireless) Link UDP, TCP, ... Transport Codecs IP Application Signaling (Wireless) Link UDP, TCP, ... Transport Codecs Physical H.323, SIP
  • 5. H.323
    • ITU-T
  • 6. Conferencing Channel Usage & Capabilities Call Signaling & Call Setup H.323 Terminal (IP) Real-time Transport Registration & Admission/Status
  • 7. SIP - RFC2543
    • SIP is a scalable and secure protocol for handling any type of session(s) invitations on the Internet.
    SIP (sessions) SAP (announcing) RTSP (media-on-demand) UDP TCP . IPv4 IPv6 SDP (describing) IETF MM Architecture … RTP ... Courtesy: SIP-Factory UAB
  • 8. SIP Architecture SIP Proxy Server SIP Redirect Server SIP Client sip:steve@ericsson.com sip:joe@ericsson.com sip:foo@abc.com sip:bar@acme.com SIP signaling Session(?) (1) (1) (2) (2) (3) (3) Courtesy: SIP-Factory UAB
  • 9. SIP Facts
    • Session Initiation Protocol, RFC2543
    • Text based (Unicode)
    • Transported over UDP (must), TCP, multicast
    • Simple: INVITE, REGISTER, ACK, BYE, OPTIONS, CANCEL
    • Uses URLs for addressing
    • Scalable through the usage of DNS for SIP server location, the SIP server is then used to locate a user
    • Can handle POTS, VAS and IN services as well as more advanced services
    Courtesy: SIP-Factory UAB
  • 10. SIP vs. H.323
    • One Purpose
    • Open, Extensible
    • Simple
    • Text, ...
    • 8-9 Protocols
    • ISDN
    • Complex
    • ASN.1
  • 11. QoS
    • Jitter (Routers)
    • Delay
      • Codec, Packetization, Routers,
    • Echo
      • 2-4 wire (to SCN), Microphone/Speaker
    • Bandwidth (1.2 kbps, …)
    • Call setup (text)
  • 12. Motivation #1
    • VoIP is an important Application Enabler
    • Applications run in the (mobile) terminal
      • facilitates end-to-end delivery
    • React on any event
      • Adaptation to the user, the user’s context, the communication and the communication content
  • 13. Motivation #2
    • Cost
      • Shorter Development Times (TTM)
      • Lower Cost of the Infrastructure
      • More Optimal Use of the Infrastructure
  • 14. Motivation
    • VoIP (and over Wireless) actually works
    • But not unless you work on it...
      • Bandwidth
      • Speech Quality
      • Latency
  • 15.  
  • 16. VoIP, where?
    • Internet-Telephony
    • IP-Telephony
    IP Gateway VoIP
  • 17. VoIP, where?
    • PhoneDoubler
    IP Gateway VoIP+POTS
  • 18. VoIP, where?
    • GSM-on-the-Net
    Internet Intranet PBX, Gateway Base Station, Gateway VoIP Gateway Tunneled GSM
  • 19. VoIP, where?
    • VoIPoW
    IP IP VoIPoW Base Station, Router CTRL ALT DEL CTRL ALT DEL
  • 20. VoIP, where?
    • HomeCom
    IP IP VoIPoW VoIP Base Station = Router IP over ADSL, … SIP Security, Caching Agents Homing from * CTRL ALT DEL CTRL ALT DEL
  • 21. Application Enablers
    • Agents
    • Sensors
      • Information
      • Physical: GPS, Accelerometer, ...
    • Short-range radio
    • Header Compression (VoIPoW)
  • 22. VoIPoB? IP Application (VoIP) Signaling Bluetooth UDP, TCP, ... Transport Codecs IP Application Bluetooth UDP, TCP, ... Voice
  • 23. Communication Space Non-physical Objects Users Artifacts
  • 24. Example H.323 VGW Agents SIP Customers Agents Contact Center
  • 25. Contact Center Prototype
  • 26. Service Architecture Agents Device Integration Device 1..N GUI Clients ... Device1..N User 1..M Basic Services Service 1..K
  • 27. ... Device 1..D User 1..U Service 1..K SIP Redirect Server Location Server Voice Server Voice Gateway Information Display Badge (Receiver) Mobile Agents Mobile Device(s) Network SIP Client ... Active Contexts Agent Server Infra- structure Clients Services Devices ...
  • 28. Application Stack IP Agent Address (SIP) (Wireless) Link RTP Codecs UDP, TCP Mobile-IP VoIP (H.323) Location (rwhois, LDAP, ...) Agent Communi-cation (KQML) H.245 Q.931 RAS
  • 29. Streaming Media Delivery Application IP SIP RTP TCP UDP IP Mobile-IP Packet Radio GUI SIP Bluetooth IP S 1 S n GPRS Network-Speaker Network-Camera Network-Microphone Network-Display Network-Printer Delivery Mgt Adapt. Content Mgt
  • 30. Deregulated Wireless Internet Broadband IP GWs 3d-Party R Content Hosting, AAA, E-Cash/Access Bågen, Power Industry, FramFab, ...? 3G/IPv4
  • 31. Do-It-Yourself Hotspots BÅGEN CSlab Bågen Farsta Kista Content, Mobile Group Mgt SIP-server, Voice GW Wireless LAN
  • 32. Conclusions
    • New Service Architecture
      • integration of VoIP in User Interface
      • open-ended functionality
      • trigger on any event
      • framework for rapid introduction
      • permits user to extend and manage the functionality
      • services are no longer packaged with the network access
  • 33. Conclusions, Cont.
    • Low cost of the infrastructure
    • Ubiquitous Computing @ Home
      • VoIP, Mobile Agents, SIP, Wireless
    • Obstacles
      • Security and Privacy need to be addressed
      • Plug and play of devices and services
    • Do it to them before they do it to us
  • 34. Further Info...
    • Theo Kanter
    • Ericsson Research
      • [email_address]
    • Computer Communication Systems Laboratory
      • [email_address]
      • http://www.it.kth.se/~theo
  • 35. VoIP, where?
    • Internet-, IP-Telephony
    IP IP Gateway VoIPoW Base Station, Gateway VoIP CTRL ALT DEL CTRL ALT DEL