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    courses.cs.tamu.edu courses.cs.tamu.edu Presentation Transcript

    • Voice Over IP Sean Olson <sean.olson@ericsson.com> http://www.ericsson.com/mobileinternet/
    • A Truly Global Company
      • 100,000 employees and operations in 140 countries
      • International operations for more than 100 years
      • 50 R&D centers in 25 countries
      • Listed on 8 stock exchanges (ERICY)
      • Net sales (’99): USD 26 b.
      Ericsson
    • Dynamic Growth in Mobile Internet 0 200 400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 1999 2000 2001 2002 2003 2004 2005 Mobile Internet Fixed Internet Subscribers (millions) Forecast of Internet users worldwide
    • Next Generation Multiservice Network Telephony + Internet/data + Video/TV Wireless/wireline access for data, telephony and cable TV: User applications Portals and servers Communications control Servers Connectivity Backbone network At home On the move At the office
    • A Network Picture IP backbone Access Access Services SIP Bearer Services oriented WireLine Bearer Services oriented WLan SIP Bearer Services oriented WireLine TA? WLan FW? TA? Services 3G Wireless FW? 3G Wireless
    • Voice Over IP (VoIP)
      • Moving from Circuit Switched to Packet
      • Convergence of Data and Telecommunications
      • New Services, New Challenges
      • The End of Black Phones?
      • Voice as an Adjunct to Data
      • Terminal, Personal, Service Mobility
      • Separation of Voice from Signalling
    • Reference Models OSI Internet Physical Data Link Network Transport Session Presentation Application Physical Data Link Network Transport Application
    • VoIP Layers
      • Application (Call Control) - SIP, H.323, RSVP, HTTP, etc.
      • Transport - SCTP, TCP, UDP, UDP-lite, TLS, WTLS
      • Network - IPv6/IPv4
      • Data Link/Physical - 10Mb Ethernet
    • NextGen IP Infrastructure
      • IPv6 and IPv4
      • QoS (RSVP, DiffServ, MPLS, …)
      • NATP and Firewalls
      • IPSec
      • Mobile IP
      • VPN
      • ATM Backbone
    • IPv6
      • 128 bit addresses (FEDC:BA98:7654:3210:FEDC:BA98:7654:3210)
      • Anycast addressing
      • Link-local and Site-local addressing
      • “Classless” Routing
      • Aggregatable addresses
      • Support for Multicasting, MobileIP
      • Autoconfiguration
    • IPSec
      • Provides integrity protection, authentication, and encryption of the IP payload
      • Part of IPv6 umbrella of standards
      • Becoming de-facto standard for IP security
      • Changes dimensioning of IP network
    • SCTP
      • Stream Control Transmission Protocol (RFC2960)
      • Potentially the next TCP
      • Multihome with failover support
      • Connection-oriented datagram service
      • Multiple streams per association
      • Integrity protection (MAC)
    • Session Initiation Protocol (SIP)
      • Signaling protocol for VoIP
      • Based on HTTP
      • IETF equivalent of H.323
      • Provides true multimedia - not just voice
      • Separates signaling from bearer
      • Separates device from user
    • Wireless Communications
      • High Latency (~ 120ms upper bound)
      • High Bit Error Rate
      • Unequal Value of Data Bits
      • Point-to-Point, Point-to-Manypoint, Broadcast
      • QoS mechanisms essential
      • Encryption mechanisms mandatory
    • Standards Bodies
      • IETF (Internet)
      • 3GPP (GSM)
      • 3GPP2 (CDMA)
      • MWIF (Worldwide)
      • ETSI (Europe, Telecom)
      • ITU-T (International, Telecom)
      • ANSI / TIA (North America)
    • IETF
      • Internet Engineering Task Force
      • Provides Standards for DNS, IPv6, DHCP, SIP, etc.
      • Open to anyone!
      • Simple Process: I-Ds, RFCs
      • http://www.ietf.org
      • Participate through e-mail
    • XoIP
      • Everything is data
      • Intelligence is in the endpoints
      • Core network provides security, AAA, QoS
      • Namespaces are global
      • Firewalls disappear …
      • Multiple access networks
      • Identity is ephemeral
      • Mobile Ad-Hoc Networks (MANET)
    • Learning More
      • http://www.ietf.org
      • http://www.ericsson.com/mobileinternet
      • http://www.cs.columbia.edu/sip
      • http://www.cisco.com
    • Q & A