Voice and Telephony over IP
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1 Voice and Telephony over IP Nicolas Montavont Universidad de los Andes Merida, Venezuela May 2011 Presenters!Andres Arcia! German Castignani (since 2009) PhD student at Telecom Bretagne Working on the exploitation of heterogeneous networks and multi-objective optimization frameworks for energy efficient interface selection Master research on IEEE mobility management (2009) Engineering degree in Informatics from the University of Buenos Aires! Nicolas Montavont (since 2005) Associate Professor at Telecom Bretagne Working on Mobility and multihoming management, wireless technologies and IPv6 (04-05) Post-doc at National Institute of Standard and Technologies (NIST) Washington DC, USA on Cross layer mobility management (01-04) PhD from the University of Strasbourg France on multiple interfaces management for IPv6 Mobile Hosts (2001) Master Sc. from the University of Strasbourg and Lyon 2
2 !Day 1: introduction Overview of the class Practical work: analyse a Voice over IP call Telephony networks - Fixed telephony - GSM network!day 2: Basis Overview of an IP network Basics of Voice over IP!Day 3: exercises Study of RFC SIP!Day 4: signalling protocols SIP H323!Day 5 Practical work on SIP 3 Bibliography! General Kurose and Ross, Computer Networking, a top-down approach, 5th edition, person! Signaling protocol for session management Alan B. Johnston, SIP Understanding the Session Initiation Protocol, second edition, ARtech House Publishers Vineet Kumar, Markku Korpi, Sentil Sengodan, IP Telephony with H.323, Architecture for Unified Networks and Integrated Services, Wiley Ken Camp, IP Telephony demystified, McGraw-Hill Networking! Websites
3 About the slides!many thanks to (alphabetic order) Annie Gravey (Telecom Bretagne) David Ros (Telecom Bretagne) Emil Ivov (jitsi) G6 - the french IPv6 task force German Castignani (Telecom Bretagne) Gilbert Martineau (Telecom Bretagne Kurose and Ross - Computer Network, a top down approach Laurent Toutain (Telecom Bretagne) Xavier Lagrange (Telecom Bretagne) 5 What s the Internet: nuts and bolts view!millions of connected computing devices: hosts = end systems Running network apps! Communication links fiber, copper, radio, satellite Transmission rate = bandwidth Mobile network Home network Global ISP Regional ISP!Routers Institutional network Forward packets (chunks of data) Source: Kurose and Ross 6
4 What s the Internet: nuts and bolts view!protocols control sending, receiving of msgs e.g., TCP, IP, HTTP, Skype, Ethernet!Internet: network of networks loosely hierarchical public Internet versus private intranet!internet standards RFC: Request for comments IETF: Internet Engineering Task Force Mobile network Global ISP Home network Regional ISP Institutional network Source: Kurose and Ross 7 Internet Applications!Usual Internet Applications FTP File Transfer Protocol Web browsing (HTTP) Chat!Mutlimedia applications Voice and video over IP!More recent applications Peer-to-peer (bittorrent, emule) 8
5 What is the telephony network and application?!a dedicated network for a single application! Passband for the voice transmission is [300; 3400Hz]! Circuit switched network Communication circuit reservation Need for a call setup and clear-down! Digital transmission of the signal Pulse Code Modulation (PCM) Voice rate is 64 kbps! Signaling network is independent from the voice transmission network 9 Multimedia over IP! Use the existing network for multimedia applications Telephone voice call (1-1, n-n) Video call (becomes visio-conference) Streaming! A very challenging support Design problem of the Internet (connection-less, best effort) Need for Quality of service, while in the Internet, we see - Losses - Delay - Sequence loss MEDIA 10
6 The playout aggregation - burst scattering Data sent Packets sent at constant rate (periodic) Transport jitter Received flow Packets that are re-organized at a constant rate (periodic) buffered data client playout delay t 11 VoIP network core (registrars, proxies, ) Direct Media Connection Bob Address: B Port: Pb Alice Address: A Port: Pa 12
7 Protocols!Transporting digitalized audio and video: RTP!Optimizing traffic (QoS): IntServ, DiffServ, MPLS!Transporting signaling: UDP, TCP, SCTP!Signaling: SIP H.323 MGCP IAX XMPP - Jingle 13 What s next?!let s see how it works in real Practical work: analyse a VoIP call with Wireshark 14
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