IK2554 Practical Voice Over IP (VoIP): SIP and related protocols Fall 2008, Period 1 Lecture notes of G. Q. Maguire Jr. For use in conjunction with : • Henry Sinnreich and Alan B. Johnston, Internet Communications Using SIP: Delivering VoIP and Multimedia Services with Session Initiation Protocol, KTH Information and Communication Technology 2nd Edition, Wiley, August 2006, ISBN: 0-471-77657-2. © 2004, 2005, 2006, 2007, 2008 G.Q.Maguire Jr. All rights reserved. No part of this course may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without written permission of the author. Last modified: 2008.09.02:13:22 Maguire Cover.fm Total pages: 1 [email protected] 2008.09.02 Module 1: Introduction........................................................................... 24 Welcome to the course! .......................................................................... 25 Staff Associated with the Course............................................................ 26 Instructor (Kursansvarig) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26 Administrative Assistant: recording of grades, registration, etc. - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 26 Goals, Scope and Method....................................................................... 27 Goals of the Course - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27 Scope and Method - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 27 Learning Outcomes................................................................................. 28 Prerequisites............................................................................................ 30 Contents .................................................................................................. 31 Topics ..................................................................................................... 32 Examination requirements...................................................................... 33 Grades: A..F (ECTS grades)................................................................... 34 Project..................................................................................................... 36 Assignment Registration and Report...................................................... 37 Literature................................................................................................. 39 Observe proper academic ethics and properly cite your sources! .......... 40 Ethics, Rights, and Responsibilities ....................................................... 41 Maguire 2 of 23 [email protected] 2008.09.03 Practical Voice Over IP (VoIP): SIP and related protocols Lecture Plan............................................................................................ 42 Voice over IP (VoIP).............................................................................. 43 Potential Networks ................................................................................. 44 Internetworking....................................................................................... 45 VoIP a major market............................................................................... 46 Handsets.................................................................................................. 47 VoIP Chipsets ......................................................................................... 48 Deregulation ⇒ New operators ............................................................ 49 Deregulation ⇒ New Suppliers............................................................ 50 Let them fail fast!.................................................................................... 51 Latency ................................................................................................... 52 VOIP Modes of Operation...................................................................... 53 IP based data+voice infrastructure ......................................................... 54 Voice Gateway........................................................................................ 55 Voice over IP (VOIP) Gateways ............................................................ 56 Voice representation - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 56 Signaling - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 Fax Support - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 Management- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 57 Maguire 3 of 23 [email protected] 2008.09.03 Practical Voice Over IP (VoIP): SIP and related protocols Compatibility - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 58 Cisco’s Voice Over IP ............................................................................ 59 Intranet Telephone System ..................................................................... 62 Wireless LANs........................................................................................ 63 Telia’s HomeRun.................................................................................... 64 Ericsson’s "GSM on the Net"................................................................. 65 VOIP vs. traditional telephony ............................................................... 66 Economics .............................................................................................. 67 VoIP vs. traditional telephony ................................................................ 68 Patents..................................................................................................... 69 Deregulation ⇒ Trends ........................................................................ 71 Carriers offering VOIP ........................................................................... 72 MCI (formerly WorldCom) Connection................................................. 73 Previously - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73 Today - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 73 Level 3 Communications Inc.................................................................. 74 TeliaSonera Bredbandstelefoni............................................................... 75 Emulating the PSTN............................................................................... 76 Maguire 4 of 23 [email protected] 2008.09.03 Practical Voice Over IP (VoIP): SIP and related protocols Calling and Called Features.................................................................... 78 Beyond the PSTN: Presence & Instant Messaging................................. 79 Presence-Enabled Services ..................................................................... 80 Three major alternatives for VoIP .......................................................... 81 Negatives ................................................................................................ 82 Deregulation ⇒ New Regulations........................................................ 83 Regulations in Sweden ........................................................................... 84 Programmable “phone” .......................................................................... 85 Conferences ............................................................................................ 86 Not with out problems ............................................................................ 87 References and Further Reading............................................................. 88 Acknowledgements................................................................................. 92 Module 2: VoIP details........................................................................... 93 Traditional Telecom vs. Datacom........................................................... 94 VoIP details: Protocols and Packets ....................................................... 95 RTP and H.323 for IP Telephony .......................................................... 96 RTP, RTCP, and RTSP........................................................................... 97 Maguire 5 of 23 [email protected] 2008.09.03 Practical Voice Over IP (VoIP): SIP and related protocols Real-Time Delivery ................................................................................ 98 Packet delay............................................................................................ 99 Dealing with Delay jitter ...................................................................... 100 Delay and delay variance (jitter)........................................................... 101