Sip Security

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SIP Security

Author : Dorgham Sisalem
Publisher : John Wiley & Sons
ISBN 13 : 9780470516980
Total Pages : 350 pages
Book Rating : 4.5/5 (169 download)

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Book Synopsis SIP Security by : Dorgham Sisalem

Download or read book SIP Security written by Dorgham Sisalem and published by John Wiley & Sons. This book was released on 2009-03-23 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives a detailed overview of SIP specific security issues and how to solve them While the standards and products for VoIP and SIP services have reached market maturity, security and regulatory aspects of such services are still being discussed. SIP itself specifies only a basic set of security mechanisms that cover a subset of possible security issues. In this book, the authors survey important aspects of securing SIP-based services. This encompasses a description of the problems themselves and the standards-based solutions for such problems. Where a standards-based solution has not been defined, the alternatives are discussed and the benefits and constraints of the different solutions are highlighted. Key Features: Will help the readers to understand the actual problems of using and developing VoIP services, and to distinguish between real problems and the general hype of VoIP security Discusses key aspects of SIP security including authentication, integrity, confidentiality, non-repudiation and signalling Assesses the real security issues facing users of SIP, and details the latest theoretical and practical solutions to SIP Security issues Covers secure SIP access, inter-provider secure communication, media security, security of the IMS infrastructures as well as VoIP services vulnerabilities and countermeasures against Denial-of-Service attacks and VoIP spam This book will be of interest to IT staff involved in deploying and developing VoIP, service users of SIP, network engineers, designers and managers. Advanced undergraduate and graduate students studying data/voice/multimedia communications as well as researchers in academia and industry will also find this book valuable.

Handbook on Session Initiation Protocol

Author : Radhika Ranjan Roy
Publisher : CRC Press
ISBN 13 : 1315362074
Total Pages : 893 pages
Book Rating : 4.3/5 (153 download)

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Book Synopsis Handbook on Session Initiation Protocol by : Radhika Ranjan Roy

Download or read book Handbook on Session Initiation Protocol written by Radhika Ranjan Roy and published by CRC Press. This book was released on 2018-09-03 with total page 893 pages. Available in PDF, EPUB and Kindle. Book excerpt: Session Initiation Protocol (SIP), standardized by the Internet Engineering Task Force (IETF), has emulated the simplicity of the protocol architecture of hypertext transfer protocol (HTTP) and is being popularized for VoIP over the Internet because of the ease with which it can be meshed with web services. However, it is difficult to know exactly how many requests for comments (RFCs) have been published over the last two decades in regards to SIP or how those RFCs are interrelated. Handbook on Session Initiation Protocol: Networked Multimedia Communications for IP Telephony solves that problem. It is the first book to put together all SIP-related RFCs, with their mandatory and optional texts, in a chronological and systematic way so that it can be used as a single super-SIP RFC with an almost one-to-one integrity from beginning to end, allowing you to see the big picture of SIP for the basic SIP functionalities. It is a book that network designers, software developers, product manufacturers, implementers, interoperability testers, professionals, professors, and researchers will find to be very useful. The text of each RFC from the IETF has been reviewed by all members of a given working group made up of world-renowned experts, and a rough consensus made on which parts of the drafts need to be mandatory and optional, including whether an RFC needs to be Standards Track, Informational, or Experimental. Texts, ABNF syntaxes, figures, tables, and references are included in their original form. All RFCs, along with their authors, are provided as references. The book is organized into twenty chapters based on the major functionalities, features, and capabilities of SIP.

SIP Handbook

Author : Syed A. Ahson
Publisher : CRC Press
ISBN 13 : 1420066048
Total Pages : 633 pages
Book Rating : 4.4/5 (2 download)

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Book Synopsis SIP Handbook by : Syed A. Ahson

Download or read book SIP Handbook written by Syed A. Ahson and published by CRC Press. This book was released on 2018-10-03 with total page 633 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widely adopted by service providers to enable IP telephony, instant messaging, and other data services, SIP is the signaling protocol of choice for advanced multimedia communications signaling. Compiled by noted engineering experts Syed Ahson and Mohammad Ilyas, SIP Handbook: Services, Technologies, and Security of Session Initiation Protocol presents a thorough technical review of all aspects of SIP. It captures the current state of IP Multimedia Subsystem technology and provides a unique source of comprehensive reference material on this subject. SIP Applications for Today and Tomorrow The scope of this volume ranges from basic concepts to future perspectives. Divided into three sections, the book begins with a discussion of SIP in peer-to-peer networks and then goes on to examine advanced media integration, migration considerations, mobility management, and group conferencing, while also reviewing home networking and compliance issues. The middle section of the book focuses on the underlying technologies of SIP. Chapters review network architecture, vertical handoffs, NAT traversals, multipoint extensions, and other areas at the forefront of research. Finally, the text examines various security vulnerabilities and provides perspectives on secure intelligent SIP services with a future outlook on a fraud detection framework in VoIP networks. Insights from International Researchers Authored by 65 experts from across the world, this text is sure to advance the field of knowledge in this ever-changing industry and provide further impetus for new areas of exploration. Because of the editors’ pivotal influence and their proximity to both the current market and the latest science, this work is certain to become the definitive text on this emerging technology.

Information Security and Digital Forensics

Author : Dasun Weerasinghe
Publisher : Springer Science & Business Media
ISBN 13 : 3642115292
Total Pages : 191 pages
Book Rating : 4.6/5 (421 download)

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Book Synopsis Information Security and Digital Forensics by : Dasun Weerasinghe

Download or read book Information Security and Digital Forensics written by Dasun Weerasinghe and published by Springer Science & Business Media. This book was released on 2010-01-13 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt: ISDF 2009, the First International Conference on Information Security and Digital Forensics, was held at City University London during September 7-8, 2009. The c- ference was organized as a meeting point for leading national and international - perts of information security and digital forensics. The conference was rewarding in many ways; ISDF 2009 was an exciting and vibrant event, with 4 keynote talks, 25 invited talks and 18 full-paper presentations and those attending had the opportunity to meet and talk with many distinguished people who are responsible for shaping the area of information security. This conference was organized as part of two major research projects funded by the UK Engineering and Physical Sciences Research Council in the areas of Security and Digital Forensics. I would like to thank all the people who contributed to the technical program. The most apparent of these are the Indian delegates who all accepted our invite to give presentations at this conference. Less apparent perhaps is the terrific work of the members of the Technical Program Committee, especially in reviewing the papers, which is a critical and time-consuming task. I would like to thank Raj Rajarajan (City University London) for making the idea of the ISDF 2009 conference a reality with his hard work. Last but not least, I would like to thank all the authors who submitted papers, making the conference possible, and the authors of accepted papers for their cooperation. Dasun Weerasinghe

SIP

Author : Alan B. Johnston
Publisher : Artech House
ISBN 13 : 1607839962
Total Pages : 427 pages
Book Rating : 4.6/5 (78 download)

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Book Synopsis SIP by : Alan B. Johnston

Download or read book SIP written by Alan B. Johnston and published by Artech House. This book was released on 2009 with total page 427 pages. Available in PDF, EPUB and Kindle. Book excerpt: This cutting-edge book shows you how SIP provides a highly-scalable and cost-effective way to offer new and exciting telecommunication feature sets, helping you design your OC next generationOCO network and develop new applications and software stacks. Other key discussions include SIP as a key component in the Internet multimedia conferencing architecture, request and response messages, devices in a typical network, types of servers, SIP headers, comparisons with existing signaling protocols including H.323, related protocols SDP (Session Description Protocol) and RTP (Real-time Transport Protocol), and the future direction of SIP. Detailed call flow diagrams illustrate how this technology works with other protocols such as H.323 and ISUP. Moreover, this book covers SIP RFC 3261 and the complete set of SIP extension RFCs."

SIP Handbook

Author : Syed A. Ahson
Publisher : CRC Press
ISBN 13 : 1351834827
Total Pages : 536 pages
Book Rating : 4.3/5 (518 download)

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Book Synopsis SIP Handbook by : Syed A. Ahson

Download or read book SIP Handbook written by Syed A. Ahson and published by CRC Press. This book was released on 2018-10-03 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt: Widely adopted by service providers to enable IP telephony, instant messaging, and other data services, SIP is the signaling protocol of choice for advanced multimedia communications signaling. Compiled by noted engineering experts Syed Ahson and Mohammad Ilyas, SIP Handbook: Services, Technologies, and Security of Session Initiation Protocol presents a thorough technical review of all aspects of SIP. It captures the current state of IP Multimedia Subsystem technology and provides a unique source of comprehensive reference material on this subject. SIP Applications for Today and Tomorrow The scope of this volume ranges from basic concepts to future perspectives. Divided into three sections, the book begins with a discussion of SIP in peer-to-peer networks and then goes on to examine advanced media integration, migration considerations, mobility management, and group conferencing, while also reviewing home networking and compliance issues. The middle section of the book focuses on the underlying technologies of SIP. Chapters review network architecture, vertical handoffs, NAT traversals, multipoint extensions, and other areas at the forefront of research. Finally, the text examines various security vulnerabilities and provides perspectives on secure intelligent SIP services with a future outlook on a fraud detection framework in VoIP networks. Insights from International Researchers Authored by 65 experts from across the world, this text is sure to advance the field of knowledge in this ever-changing industry and provide further impetus for new areas of exploration. Because of the editors’ pivotal influence and their proximity to both the current market and the latest science, this work is certain to become the definitive text on this emerging technology.

Internet Communications Using SIP

Author : Henry Sinnreich
Publisher : John Wiley & Sons
ISBN 13 : 111842915X
Total Pages : 354 pages
Book Rating : 4.1/5 (184 download)

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Book Synopsis Internet Communications Using SIP by : Henry Sinnreich

Download or read book Internet Communications Using SIP written by Henry Sinnreich and published by John Wiley & Sons. This book was released on 2012-07-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This book is like a good tour guide.It doesn't just describe the major attractions; you share in the history, spirit, language, and culture of the place." --Henning Schulzrinne, Professor, Columbia University Since its birth in 1996, Session Initiation Protocol (SIP) has grown up. As a richer, much more robust technology, SIP today is fully capable of supporting the communication systems that power our twenty-first century work and life. This second edition handbook has been revamped to cover the newest standards, services, and products. You'll find the latest on SIP usage beyond VoIP, including Presence, instant messaging (IM), mobility, and emergency services, as well as peer-to-peer SIP applications, quality-of-service, and security issues--everything you need to build and deploy today's SIP services. This book will help you * Work with SIP in Presence and event-based communications * Handle SIP-based application-level mobility issues * Develop applications to facilitate communications access for users with disabilities * Set up Internet-based emergency services * Explore how peer-to-peer SIP systems may change VoIP * Understand the critical importance of Internet transparency * Identify relevant standards and specifications * Handle potential quality-of-service and security problems

Understanding SIP Servlets 1.1

Author : Chris Boulton
Publisher : Artech House
ISBN 13 : 1596934298
Total Pages : 313 pages
Book Rating : 4.5/5 (969 download)

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Book Synopsis Understanding SIP Servlets 1.1 by : Chris Boulton

Download or read book Understanding SIP Servlets 1.1 written by Chris Boulton and published by Artech House. This book was released on 2009 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing a thorough overview to SIP (session initiation protocol) servlets 1.1, this unique resource serves as a practical guide to this exciting and emerging communications network technology. Covering all key concepts and their links into Java Enterprise Edition (JEE), the book discusses the construction, deployment and lifecycle of the SIP servlet.

SIP: Understanding the Session Initiation Protocol, Fourth Edition

Author : Alan B. Johnston
Publisher : Artech House
ISBN 13 : 1608078647
Total Pages : 520 pages
Book Rating : 4.6/5 (8 download)

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Book Synopsis SIP: Understanding the Session Initiation Protocol, Fourth Edition by : Alan B. Johnston

Download or read book SIP: Understanding the Session Initiation Protocol, Fourth Edition written by Alan B. Johnston and published by Artech House. This book was released on 2015-11-01 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now in its fourth edition, the ground-breaking Artech House bestseller SIP: Understanding the Session Initiation Protocol offers you the most comprehensive and current understanding of this revolutionary protocol for call signaling and IP Telephony. The fourth edition incorporates changes in SIP from the last five years with new chapters on internet threats and attacks, WebRTC and SIP, and substantial updates throughout. This cutting-edge book shows how SIP provides a highly-scalable and cost-effective way to offer new and exciting telecommunication feature sets, helping practitioners design “next generation” network and develop new applications and software stacks. Other key discussions include SIP as a key component in the Internet multimedia conferencing architecture, request and response messages, devices in a typical network, types of servers, SIP headers, comparisons with existing signaling protocols including H.323, related protocols SDP (Session Description Protocol) and RTP (Real-time Transport Protocol), and the future direction of SIP.

Security for Mobility

Author : Chris J. Mitchell
Publisher : IET
ISBN 13 : 0863413374
Total Pages : 468 pages
Book Rating : 4.8/5 (634 download)

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Book Synopsis Security for Mobility by : Chris J. Mitchell

Download or read book Security for Mobility written by Chris J. Mitchell and published by IET. This book was released on 2004 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book covers many aspects of security for mobility including current developments, underlying technologies, network security, mobile code issues, application security and the future.

Securing Cisco IP Telephony Networks

Author : Akhil Behl
Publisher : Cisco Press
ISBN 13 : 0132731061
Total Pages : 1155 pages
Book Rating : 4.1/5 (327 download)

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Book Synopsis Securing Cisco IP Telephony Networks by : Akhil Behl

Download or read book Securing Cisco IP Telephony Networks written by Akhil Behl and published by Cisco Press. This book was released on 2012-08-31 with total page 1155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The real-world guide to securing Cisco-based IP telephony applications, devices, and networks Cisco IP telephony leverages converged networks to dramatically reduce TCO and improve ROI. However, its critical importance to business communications and deep integration with enterprise IP networks make it susceptible to attacks that legacy telecom systems did not face. Now, there’s a comprehensive guide to securing the IP telephony components that ride atop data network infrastructures–and thereby providing IP telephony services that are safer, more resilient, more stable, and more scalable. Securing Cisco IP Telephony Networks provides comprehensive, up-to-date details for securing Cisco IP telephony equipment, underlying infrastructure, and telephony applications. Drawing on ten years of experience, senior network consultant Akhil Behl offers a complete security framework for use in any Cisco IP telephony environment. You’ll find best practices and detailed configuration examples for securing Cisco Unified Communications Manager (CUCM), Cisco Unity/Unity Connection, Cisco Unified Presence, Cisco Voice Gateways, Cisco IP Telephony Endpoints, and many other Cisco IP Telephony applications. The book showcases easy-to-follow Cisco IP Telephony applications and network security-centric examples in every chapter. This guide is invaluable to every technical professional and IT decision-maker concerned with securing Cisco IP telephony networks, including network engineers, administrators, architects, managers, security analysts, IT directors, and consultants. Recognize vulnerabilities caused by IP network integration, as well as VoIP’s unique security requirements Discover how hackers target IP telephony networks and proactively protect against each facet of their attacks Implement a flexible, proven methodology for end-to-end Cisco IP Telephony security Use a layered (defense-in-depth) approach that builds on underlying network security design Secure CUCM, Cisco Unity/Unity Connection, CUPS, CUCM Express, and Cisco Unity Express platforms against internal and external threats Establish physical security, Layer 2 and Layer 3 security, and Cisco ASA-based perimeter security Complete coverage of Cisco IP Telephony encryption and authentication fundamentals Configure Cisco IOS Voice Gateways to help prevent toll fraud and deter attacks Secure Cisco Voice Gatekeepers and Cisco Unified Border Element (CUBE) against rogue endpoints and other attack vectors Secure Cisco IP telephony endpoints–Cisco Unified IP Phones (wired, wireless, and soft phone) from malicious insiders and external threats This IP communications book is part of the Cisco Press® Networking Technology Series. IP communications titles from Cisco Press help networking professionals understand voice and IP telephony technologies, plan and design converged networks, and implement network solutions for increased productivity.

IBM WebSphere Application Server V7.0 Security

Author : Omar Siliceo
Publisher : Packt Publishing Ltd
ISBN 13 : 184968149X
Total Pages : 328 pages
Book Rating : 4.8/5 (496 download)

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Book Synopsis IBM WebSphere Application Server V7.0 Security by : Omar Siliceo

Download or read book IBM WebSphere Application Server V7.0 Security written by Omar Siliceo and published by Packt Publishing Ltd. This book was released on 2011-02-23 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secure your IBM WebSphere applications with Java EE and JAAS security standards using this book and eBook

Securing VoIP Networks

Author : Peter Thermos
Publisher : Pearson Education
ISBN 13 : 0132702304
Total Pages : 606 pages
Book Rating : 4.1/5 (327 download)

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Book Synopsis Securing VoIP Networks by : Peter Thermos

Download or read book Securing VoIP Networks written by Peter Thermos and published by Pearson Education. This book was released on 2007-08-01 with total page 606 pages. Available in PDF, EPUB and Kindle. Book excerpt: In Securing VoIP Networks, two leading experts systematically review the security risks and vulnerabilities associated with VoIP networks and offer proven, detailed recommendations for securing them. Drawing on case studies from their own fieldwork, the authors address VoIP security from the perspective of real-world network implementers, managers, and security specialists. The authors identify key threats to VoIP networks, including eavesdropping, unauthorized access, denial of service, masquerading, and fraud; and review vulnerabilities in protocol design, network architecture, software, and system configuration that place networks at risk. They discuss the advantages and tradeoffs associated with protection mechanisms built into SIP, SRTP, and other VoIP protocols; and review key management solutions such as MIKEY and ZRTP. Next, they present a complete security framework for enterprise VoIP networks, and provide detailed architectural guidance for both service providers and enterprise users. 1 Introduction 2 VoIP Architectures and Protocols 3 Threats and Attacks 4 VoIP Vulnerabilites 5 Signaling Protection Mechanisms 6 Media Protection Mechanisms 7 Key Management Mechanisms 8 VoIP and Network Security Controls 9 A Security Framework for Enterprise VoIP Networks 10 Provider Architectures and Security 11 Enterprise Architectures and Security

SIP

Author : Alan B. Johnston
Publisher : Artech House
ISBN 13 : 9781580536554
Total Pages : 316 pages
Book Rating : 4.5/5 (365 download)

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Book Synopsis SIP by : Alan B. Johnston

Download or read book SIP written by Alan B. Johnston and published by Artech House. This book was released on 2004 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: This newly revised edition of the ground-breaking Artech House bestseller, SIP: Understanding the Session Initiation Protocol gives you a thorough and up-to-date understanding of this revolutionary protocol for call signaling and IP Telephony. The second edition includes brand new discussions on the use of SIP for wireless multimedia communications. It explains how SIP is powerful "rendezvous" protocol that leverages mobility and presence to allow users to communicate using different devices, modes, and services anywhere they are connected to the Internet You learn why SIP has been chosen by the 3GPP (3rd Generation Partnership Program for wireless cell phones) as the core signaling, presence, and instant messaging protocol.

Handbook on Networked Multipoint Multimedia Conferencing and Multistream Immersive Telepresence using SIP

Author : Radhika Ranjan Roy
Publisher : CRC Press
ISBN 13 : 1000216330
Total Pages : 978 pages
Book Rating : 4.0/5 (2 download)

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Book Synopsis Handbook on Networked Multipoint Multimedia Conferencing and Multistream Immersive Telepresence using SIP by : Radhika Ranjan Roy

Download or read book Handbook on Networked Multipoint Multimedia Conferencing and Multistream Immersive Telepresence using SIP written by Radhika Ranjan Roy and published by CRC Press. This book was released on 2020-11-23 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt: Handbook on Networked Multipoint Multimedia Conferencing and Multistream Immsersive Telepresence using SIP: Scalable Distributed Applications and Media Control over Internet is the first book to put together all IETF request for comments (RFCs), and the internet drafts standards related to the multipoint conferencing and immersive telepresence. This book includes mandatory and optional texts of all standards in a chronological and systematic way almost with one-to-one integrity from the beginning to end, allowing the reader to understand all aspects of the highly complex real-time applications. It is a book that network designers, software developers, product manufacturers, implementers, interoperability testers, professionals, professors, and researchers will find to be immensely useful. Practitioners and engineers in all spectrums who are concentrating on building the real-time, scalable, interoperable multipoint applications, can use this book to make informed choices based on technical standards in the market place, on all proprietary non-scalable and non-interposable products. This book will provide focus and foundation for these decision makers.

Security and Privacy in Communication Networks

Author : Tanveer Zia
Publisher : Springer
ISBN 13 : 3319042831
Total Pages : 430 pages
Book Rating : 4.3/5 (19 download)

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Book Synopsis Security and Privacy in Communication Networks by : Tanveer Zia

Download or read book Security and Privacy in Communication Networks written by Tanveer Zia and published by Springer. This book was released on 2013-12-17 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-conference proceedings of the 9th International ICST Conference on Security and Privacy in Communication Networks, held in Sydney, Australia, in September 2013. The 26 revised full papers presented were carefully reviewed and selected from 70 submissions. The papers are grouped in topical sections on: security and privacy in mobile, sensor and ad hoc networks; malware, botnets and distributed denial of service; security for emerging technologies: VoIP, peer-to-peer and cloud computing; encryption and key management; security in software and machine learning; network and system security model; security and privacy in pervasive and ubiquitous computing.

Internet Multimedia Communications Using SIP

Author : Rogelio Martinez Perea
Publisher : Morgan Kaufmann
ISBN 13 : 0080557376
Total Pages : 601 pages
Book Rating : 4.0/5 (85 download)

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Book Synopsis Internet Multimedia Communications Using SIP by : Rogelio Martinez Perea

Download or read book Internet Multimedia Communications Using SIP written by Rogelio Martinez Perea and published by Morgan Kaufmann. This book was released on 2008-02-27 with total page 601 pages. Available in PDF, EPUB and Kindle. Book excerpt: Session Initiation Protocol (SIP) was conceived in 1996 as a signaling protocol for inviting users to multimedia conferences. With this development, the next big Internet revolution silently started. That was the revolution which would end up converting the Internet into a total communication system which would allow people to talk to each other, see each other, work collaboratively or send messages in real time. Internet telephony and, in general, Internet multimedia, is the new revolution today and SIP is the key protocol which allows this revolution to grow.The book explains, in tutorial fashion, the underlying technologies that enable real-time IP multimedia communication services in the Internet (voice, video, presence, instant messaging, online picture sharing, white-boarding, etc). Focus is on session initiation protocol (SIP) but also covers session description protocol (SDP), Real-time transport protocol (RTP), and message session relay protocol (MSRP). In addition, it will also touch on other application-related protocols and refer to the latest research work in IETF and 3GPP about these topics. (3GPP stands for "third-generation partnership project" which is a collaboration agreement between ETSI (Europe), ARIB/TTC (Japan), CCSA (China), ATIS (North America) and TTA (South Korea).) The book includes discussion of leading edge theory (which is key to really understanding the technology) accompanied by Java examples that illustrate the theoretical concepts. Throughout the book, in addition to the code snippets, the reader is guided to build a simple but functional IP soft-phone therefore demonstrating the theory with practical examples.This book covers IP multimedia from both a theoretical and practical point of view focusing on letting the reader understand the concepts and put them into practice using Java. It includes lots of drawings, protocol diagrams, UML sequence diagrams and code snippets that allow the reader to rapidly understand the concepts. Focus on HOW multimedia communications over the Internet works to allow readers to really understand and implement the technology Explains how SIP works, including many programming examples so the reader can understand abstract concepts like SIP dialogs, SIP transactions, etc. It is not focused on just VoIP. It looks At a wide array of enhanced communication services related to SIP enabling the reader put this technology into practice. Includes nearly 100 references to the latest standards and working group activities in the IETF, bringing the reader completely up to date. Provides a step-by-step tutorial on how to build a basic, though functional, IP soft-phone allowing the reader to put concepts into practice. For advanced readers, the book also explains how to build a SIP proxy and a SIP registrar to enhance one's expertise and marketability in this fast moving area.