Internet Technology Voice over IP

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "Internet Technology Voice over IP"

Transcription

1 Internet Technology Voice over IP Peter Gradwell

2 BT Advert from 1980s Page 2

3 Welcome to Gradwell Gradwell provides technology for every line on your business card Every product we sell solves a problem we had Page 3

4 The TCP/IP Stack Where does VoIP fit in? Page 4

5 Different Types of VoIP VoIP Comes in Many Flavours Page 5

6 Voice Protocols All systems use some kind of application protocol to communicate - SIP - H323 ( exchange - IAX (Inter Asterisk ( Protocol - Skinny (Cisco Audio is transported as RTP

7 TCP/UDP/Ports Traffic is either TCP or UDP MTU on Ethernet typically 1500 bytes 100 bytes of headers, 1400 bytes of data Lots of packet overhead Socket = IP Address + Port MTU = Max Transfer Unit/A Packet

8 Good book: If you're interested in more details You can read most of it on amazon

9 H.323 Point to Point Protocol H.323 is actually a family of protocols H.323 is used a lot on trunk routes, as it's signalling reflects ISDN, but is becoming obsolete Modem over IP Conferencing Fax 9

10 Inter-Asterisk exchange Asterisk is a major OpenSource phone system IAX was invented by Mark Spencer/Digium Single UDP stream port 4569 Handles the Media inband on the same socket - Can support multiple RTP streams - Single signalling link - Far more bandwidth efficient - Also much friendlier for firewalls - Pronounced eeks 10

11 SIP Session Initiation Protocol SIP is the dominant VoIP protocol It's a peer to peer protocol, unlike H

12 SIP Addressing SIP is very similar to and HTTP URI Address format:

13 Types of SIP Message INVITE An INVITE method indicates that the recipient user or service is invited to participate in a session. ACK - An ACK request confirms that the UAC has received the final response to an INVITE request. - ACK is used only with INVITE requests. ACK is sent end to end for a 200 OK response. OPTIONS A UA uses the OPTIONS request to query a UAS about its capabilities BYE A UA uses BYE to request the termination of a previously established session. CANCEL The CANCEL request enables UACs and network servers to cancel an in-progress request, such as INVITE. This does not affect completed requests in which the UAS had already sent final responses. REGISTER A client uses a REGISTER request to register its current location information corresponding to the AOR of the user with SIP servers. 13

14 SIP Registration Phone registers periodically to tell the SIP server where it is 14

15 SIP Call Flow 15

16 A Complete Call Often we'll draw SIP call path diagrams out like this for debugging 16

17 Debug using wireshark 17

18 You can also do redirects 18

19 Codecs Nyquist theorem states that if you sample an analog signal at twice the rate of the highest frequency of interest, you can accurately reconstruct that signal back into its analog form Audio is sampled at 8k or 16k times per second (Hertz) Pulse Code Modulation Codecs trade off quality, bandwidth and CPU to produce an RTP data packet ( 16k ) Narrow Band (8k) or Wide Band We waste loads of Bandwidth on packet overhead Audio transmitted as RTP Codec BR NEB G Kbps 87.2 Kbps G Kbps 31.2 Kbps G Kbps 21.9 Kbps G Kbps 20.8 Kbps G Kbps 55.2 Kbps G Kbps 47.2 Kbps G Kbps 31.5 Kbps ilbc 15 Kbps 27.7 Kbps BR = Bit rate NEB = Nominal Ethernet ( direction Bandwidth (one Skype uses ilbc and ISAC

20 Jitter & Packet Loss Jitter is the variation of packet interarrival time Jitter is a major problem - The internet is asymmetrical - Manage the problem with a Jitter buffer ~ 20ms

21 Quality of Service QoS is needed if a network link is congested Routers need to enforce traffic prioritisation across their links How do they decide? - Trust the user? - DiffServ, Expedited Forwarding and Low Delay bits in IP header - Trust the network all traffic on port X or from IP address Y is special 21

22 Shift Change in the handset industry What about Mobile Handsets? SIP over WiFi has a very bad user experience Still difficult to setup GSM Calls Just work Costs of calling can be fixed commercially e.g. All inclusive call plans Operators are not keen on offloading voice minutes onto their data networks iphone & Google Voice are changing things Page 22

23 Which Mobile App Should I run? Page 23

24 Google Voice Video Page 24

25 What is ENUM User ENUM - Allows users to define how calls should be routed to their numbers - Stores telephone numbers in DNS and routing records ENUM = E.164 NUmber Mapping (E164 is an ITU standard) Needs a new root -.e164.arpa - Managed by RIPE Numbers stored in reverse becomes e164.arpa

26 What is ENUM DNS uses a special form of record - Name Authority Pointer (NAPTR) - RFC2915 NAPTR contains a URI - Information on how to route call - Can specify multiple ways to call - VoIP (SIP/H323) - - Tel(ephone) - Fax NAPTR records can be very sophisticated - Can contain time of day and other information - Can contain regular expressions so say a SIP record relates to the ENUM data - (Generic ENUM records for a telco)

27 What is ENUM $ORIGIN e164.arpa. IN NAPTR "u" "E2U+sip" IN NAPTR "u" "E2U+ " This is a record for / 102 is priority - Lowest number, highest priority 10 is a preference level - Can be ignored here as both records 10 u is a user record i.e. stop processing E2U+sip is the way of writing it s a SIP record Regular expression and the final destination

28 ENUM call Company A Dials PSTN Company B No ENUM Internet

29 ENUM call Company A Dials PSTN Company B arpa ENUM Internet D N S

30 ENUM in production Asterisk supports ENUM out the box OpenSIPS has an ENUM module Various PBX suppliers can support ENUM though may require special configuration Nominet have developed an Android application Enumdroid - Integrated into dialer ENUM in the UK is currently looking for users -

31 Enumdroid real life app Developed by Nominet s Ray Bellis published as open source. Available on the Android Marketplace Dial the number of your contact Application performs an ENUM query and Presents the user the options available Caller make decision of call method and places the call. Presents a number of options Has flexibility to turn off GSM if necessary

32 Enumdroid real life app Developed by Nominet s Ray Bellis published as open source. Available on the Android Marketplace Dial the number of your contact Application performs an ENUM query and Presents the user the options available Caller make decision of call method and places the call. Presents a number of options Has flexibility to turn off GSM if necessary

33 Enumdroid real life app Developed by Nominet s Ray Bellis published as open source. Available on the Android Marketplace Dial the number of your contact Application performs an ENUM query and Presents the user the options available Caller make decision of call method and places the call. Presents a number of options Has flexibility to turn off GSM if necessary

34 Enumdroid real life app Developed by Nominet s Ray Bellis published as open source. Available on the Android Marketplace Dial the number of your contact Application performs an ENUM query and Presents the user the options available Caller make decision of call method and places the call. Presents a number of options Has flexibility to turn off GSM if necessary

35 ENUM Conclusions Story so far ENUM allows interoperability between carriers More than just voice Most applications can be completed thecontrolyouif, ENUM without network & devices It needs a lot of end user applications Page 35

36 Voice Over IP? Where are we at with VoIP? Protocols and services are well established & here to stay Lines (no pun intended) are bluring Network convergence is actually happening No one wants a desk phone Some of the mobile problems will be fixed commercially Some problems by changes in end user behaviour and open access to networks The desktop environment is quickly unifying Telcos still like building islands of subscribers Regulator is looking at mobile number portability ENUM gives end-user control, but no applications or drive for it Page 36

37 Any Questions? Peter Gradwell T: E: Page 37

An Introduction to VoIP Protocols

An Introduction to VoIP Protocols An Introduction to VoIP Protocols www.netqos.com Voice over IP (VoIP) offers the vision of a converged network carrying multiple types of traffic (voice, video, and data, to name a few). To carry out this

More information

SIP (Session Initiation Protocol) Technical Overview. Presentation by: Kevin M. Johnson VP Engineering & Ops

SIP (Session Initiation Protocol) Technical Overview. Presentation by: Kevin M. Johnson VP Engineering & Ops SIP (Session Initiation Protocol) Technical Overview Presentation by: Kevin M. Johnson VP Engineering & Ops Page 1 Who are we? Page 2 Who are we? Workforce Automation Software Developer Page 3 Who are

More information

Voice Over IP. Priscilla Oppenheimer www.priscilla.com

Voice Over IP. Priscilla Oppenheimer www.priscilla.com Voice Over IP Priscilla Oppenheimer www.priscilla.com Objectives A technical overview of the devices and protocols that enable Voice over IP (VoIP) Demo Packet8 and Skype Discuss network administrator

More information

A Comparative Study of Signalling Protocols Used In VoIP

A Comparative Study of Signalling Protocols Used In VoIP A Comparative Study of Signalling Protocols Used In VoIP Suman Lasrado *1, Noel Gonsalves *2 Asst. Prof, Dept. of MCA, AIMIT, St. Aloysius College (Autonomous), Mangalore, Karnataka, India Student, Dept.

More information

SIP Trunking and Voice over IP

SIP Trunking and Voice over IP SIP Trunking and Voice over IP Agenda What is SIP Trunking? SIP Signaling How is Voice encoded and transported? What are the Voice over IP Impairments? How is Voice Quality measured? VoIP Technology Confidential

More information

The SIP School- 'Mitel Style'

The SIP School- 'Mitel Style' The SIP School- 'Mitel Style' Course Objectives This course will take delegates through the basics of SIP into some very technical areas and is suited to people who will be installing and supporting SIP

More information

AV@ANZA Formación en Tecnologías Avanzadas

AV@ANZA Formación en Tecnologías Avanzadas SISTEMAS DE SEÑALIZACION SIP I & II (@-SIP1&2) Contenido 1. Why SIP? Gain an understanding of why SIP is a valuable protocol despite competing technologies like ISDN, SS7, H.323, MEGACO, SGCP, MGCP, and

More information

Internet Working 15th lecture (last but one) Chair of Communication Systems Department of Applied Sciences University of Freiburg 2005

Internet Working 15th lecture (last but one) Chair of Communication Systems Department of Applied Sciences University of Freiburg 2005 15th lecture (last but one) Chair of Communication Systems Department of Applied Sciences University of Freiburg 2005 1 43 administrational stuff Next Thursday preliminary discussion of network seminars

More information

Voice over IP (VoIP) for Telephony. Advantages of VoIP Migration for SMBs BLACK BOX. 724-746-5500 blackbox.com

Voice over IP (VoIP) for Telephony. Advantages of VoIP Migration for SMBs BLACK BOX. 724-746-5500 blackbox.com Voice over IP (VoIP) for Telephony Advantages of VoIP Migration for SMBs BLACK BOX Hybrid PBX VoIP Gateways SIP Phones Headsets 724-746-5500 blackbox.com Table of Contents Introduction...3 About Voice

More information

Voice over IP Basics for IT Technicians

Voice over IP Basics for IT Technicians Voice over IP Basics for IT Technicians White Paper Executive summary The IP phone is coming or has arrived on desk near you. The IP phone is not a PC, but does have a number of hardware and software elements

More information

TECHNICAL CHALLENGES OF VoIP BYPASS

TECHNICAL CHALLENGES OF VoIP BYPASS TECHNICAL CHALLENGES OF VoIP BYPASS Presented by Monica Cultrera VP Software Development Bitek International Inc 23 rd TELELCOMMUNICATION CONFERENCE Agenda 1. Defining VoIP What is VoIP? How to establish

More information

VIDEOCONFERENCING. Video class

VIDEOCONFERENCING. Video class VIDEOCONFERENCING Video class Introduction What is videoconferencing? Real time voice and video communications among multiple participants The past Channelized, Expensive H.320 suite and earlier schemes

More information

Indepth Voice over IP and SIP Networking Course

Indepth Voice over IP and SIP Networking Course Introduction SIP is fast becoming the Voice over IP protocol of choice. During this 3-day course delegates will examine SIP technology and architecture and learn how a functioning VoIP service can be established.

More information

VoIP and IP Telephony

VoIP and IP Telephony VoIP and IP Telephony Reach Out and Ping Someone ISAC Spring School 2006 21 March 2006 Anthony Kava, Sr. Network Admin Pottawattamie County IT Definition VoIP Voice over Internet Protocol Voice Transport

More information

ATA: An Analogue Telephone Adapter is used to connect a standard telephone to a high-speed modem to facilitate VoIP and/or calls over the Internet.

ATA: An Analogue Telephone Adapter is used to connect a standard telephone to a high-speed modem to facilitate VoIP and/or calls over the Internet. KEY VOIP TERMS 1 ACD: Automatic Call Distribution is a system used to determine how incoming calls are routed. When the ACD system receives an incoming call it follows user-defined specifications as to

More information

VoIP. Overview. Jakob Aleksander Libak jakobal@ifi.uio.no. Introduction Pros and cons Protocols Services Conclusion

VoIP. Overview. Jakob Aleksander Libak jakobal@ifi.uio.no. Introduction Pros and cons Protocols Services Conclusion VoIP Jakob Aleksander Libak jakobal@ifi.uio.no 1 Overview Introduction Pros and cons Protocols Services Conclusion 2 1 Introduction Voice over IP is routing of voice conversations over the internet or

More information

Lab Introduction software Voice over IP

Lab Introduction software Voice over IP Lab Introduction software Voice over IP 1 Lab Capability and Status Software used in this course installed in Engineering labs including the lab opened for students ENGR1506 - http://labs.ite.gmu.edu/

More information

ACD: Average Call Duration is the average duration of the calls routed bya a VoIP provider. It is a quality parameter given by the VoIP providers.

ACD: Average Call Duration is the average duration of the calls routed bya a VoIP provider. It is a quality parameter given by the VoIP providers. ACD: Average Call Duration is the average duration of the calls routed bya a VoIP provider. It is a quality parameter given by the VoIP providers. API: An application programming interface (API) is a source

More information

Preparatory Meeting for Phase 2 of Philippine National ENUM Trial

Preparatory Meeting for Phase 2 of Philippine National ENUM Trial Preparatory Meeting for Phase 2 of Philippine National Trial IP Telephony Group Advanced Science and Technology Institute Department of Science and Technology December 12, 2005 NCC-CICT Dialing Scheme

More information

VoIP with SIP. Session Initiation Protocol RFC-3261/RFC-2543. Tasuka@Tailyn.com.tw

VoIP with SIP. Session Initiation Protocol RFC-3261/RFC-2543. Tasuka@Tailyn.com.tw VoIP with SIP Session Initiation Protocol RFC-3261/RFC-2543 Tasuka@Tailyn.com.tw 1 Legacy Telephone 2 Legacy Telephone 2 Legacy Telephone 2 Legacy Telephone 2 Legacy Telephone 2 Legacy Telephone 2 Legacy

More information

The SIP School- 'Mitel Style'

The SIP School- 'Mitel Style' The SIP School- 'Mitel Style' Course Objectives This course will take delegates through the basics of SIP into some very technical areas and is suited to people who will be installing and supporting SIP

More information

White paper. SIP An introduction

White paper. SIP An introduction White paper An introduction Table of contents 1 Introducing 3 2 How does it work? 3 3 Inside a normal call 4 4 DTMF sending commands in sip calls 6 5 Complex environments and higher security 6 6 Summary

More information

Internet Voice, Video and Telepresence Harvard University, CSCI E-139. Lecture #5

Internet Voice, Video and Telepresence Harvard University, CSCI E-139. Lecture #5 Internet Voice, Video and Telepresence Harvard University, CSCI E-139 Lecture #5 Instructor: Len Evenchik len_evenchik@harvard.edu sip:len.evenchik@harvard.edu AT&T Dimension PBX, 1980 Lecture Agenda Welcome

More information

Voice over IP (VoIP) Basics for IT Technicians

Voice over IP (VoIP) Basics for IT Technicians Voice over IP (VoIP) Basics for IT Technicians VoIP brings a new environment to the network technician that requires expanded knowledge and tools to deploy and troubleshoot IP phones. This paper provides

More information

VOICE OVER IP AND NETWORK CONVERGENCE

VOICE OVER IP AND NETWORK CONVERGENCE POZNAN UNIVE RSITY OF TE CHNOLOGY ACADE MIC JOURNALS No 80 Electrical Engineering 2014 Assaid O. SHAROUN* VOICE OVER IP AND NETWORK CONVERGENCE As the IP network was primarily designed to carry data, it

More information

SIP Trunking Manual 05.15. Technical Support Web Site: http://ws1.necii.com (registration is required)

SIP Trunking Manual 05.15. Technical Support Web Site: http://ws1.necii.com (registration is required) SIP Trunking Manual 05.15 Technical Support Web Site: http://ws1.necii.com (registration is required) This manual has been developed by NEC Unified Solutions, Inc. It is intended for the use of its customers

More information

Applied Networks & Security

Applied Networks & Security Applied Networks & Security VoIP with Critical Analysis http://condor.depaul.edu/~jkristof/it263/ John Kristoff jtk@depaul.edu IT 263 Spring 2006/2007 John Kristoff - DePaul University 1 Critical analysis

More information

Chapter 10 Session Initiation Protocol. Prof. Yuh-Shyan Chen Department of Computer Science and Information Engineering National Taipei University

Chapter 10 Session Initiation Protocol. Prof. Yuh-Shyan Chen Department of Computer Science and Information Engineering National Taipei University Chapter 10 Session Initiation Protocol Prof. Yuh-Shyan Chen Department of Computer Science and Information Engineering National Taipei University Outline 12.1 An Overview of SIP 12.2 SIP-based GPRS Push

More information

Integration of GSM Module with PC Mother Board (GSM Trunking) WHITE/Technical PAPER. Author: Srinivasa Rao Bommana (srinivasrao.bommana@wipro.

Integration of GSM Module with PC Mother Board (GSM Trunking) WHITE/Technical PAPER. Author: Srinivasa Rao Bommana (srinivasrao.bommana@wipro. (GSM Trunking) WHITE/Technical PAPER Author: Srinivasa Rao Bommana (srinivasrao.bommana@wipro.com) Table of Contents 1. ABSTRACT... 3 2. INTRODUCTION... 3 3. PROPOSED SYSTEM... 4 4. SOLUTION DESCRIPTION...

More information

Voice-Over-IP. Daniel Zappala. CS 460 Computer Networking Brigham Young University

Voice-Over-IP. Daniel Zappala. CS 460 Computer Networking Brigham Young University Voice-Over-IP Daniel Zappala CS 460 Computer Networking Brigham Young University Coping with Best-Effort Service 2/23 sample application send a 160 byte UDP packet every 20ms packet carries a voice sample

More information

Frequently Asked Questions about Integrated Access

Frequently Asked Questions about Integrated Access Frequently Asked Questions about Integrated Access Phone Service How are local, long distance, and international calls defined? Local access transport areas (LATAs) are geographical boundaries set by the

More information

Online course syllabus. MAB: Voice over IP

Online course syllabus. MAB: Voice over IP Illuminating Technology Course aim: Online course syllabus MAB: Voice over IP This course introduces the principles and operation of telephony services that operate over Internet Protocol (IP) networks

More information

VoIP Bandwidth Considerations - design decisions

VoIP Bandwidth Considerations - design decisions VoIP Bandwidth Considerations - design decisions When calculating the bandwidth requirements for a VoIP implementation the two main protocols are: a signalling protocol such as SIP, H.323, SCCP, IAX or

More information

Goal We want to know. Introduction. What is VoIP? Carrier Grade VoIP. What is Meant by Carrier-Grade? What is Meant by VoIP? Why VoIP?

Goal We want to know. Introduction. What is VoIP? Carrier Grade VoIP. What is Meant by Carrier-Grade? What is Meant by VoIP? Why VoIP? Goal We want to know Introduction What is Meant by Carrier-Grade? What is Meant by VoIP? Why VoIP? VoIP Challenges 2 Carrier Grade VoIP Carrier grade Extremely high availability 99.999% reliability (high

More information

Unit 23. RTP, VoIP. Shyam Parekh

Unit 23. RTP, VoIP. Shyam Parekh Unit 23 RTP, VoIP Shyam Parekh Contents: Real-time Transport Protocol (RTP) Purpose Protocol Stack RTP Header Real-time Transport Control Protocol (RTCP) Voice over IP (VoIP) Motivation H.323 SIP VoIP

More information

SIP Trunking Quick Reference Document

SIP Trunking Quick Reference Document SIP Trunking Quick Reference Document Publication Information SAMSUNG TELECOMMUNICATIONS AMERICA reserves the right without prior notice to revise information in this publication for any reason. SAMSUNG

More information

VoIP from A to Z. NAEO 2009 Conference Cancun, Mexico

VoIP from A to Z. NAEO 2009 Conference Cancun, Mexico VoIP from A to Z NAEO 2009 Conference Cancun, Mexico VoIP glossary What is VoIP? Bandwidth Signaling Codecs Quality of Service (QoS) What is VoIP? Voice over Internet Protocol (VoIP) is the method of transmitting

More information

How to Configure the Allworx 6x, 24x and 48x for use with Integra Telecom SIP Solutions

How to Configure the Allworx 6x, 24x and 48x for use with Integra Telecom SIP Solutions How to Configure the Allworx 6x, 24x and 48x for use with Integra Telecom SIP Solutions Overview: This document provides a reference for configuration of the Allworx 6x IP PBX to connect to Integra Telecom

More information

IP Telephony and Network Convergence

IP Telephony and Network Convergence IP Telephony and Network Convergence Raimo.Kantola@hut.fi Rkantola/28.11.00/s38.118 1 Today corporations have separate data and voice networks Internet Corporate Network PSTN, ISDN Rkantola/28.11.00/s38.118

More information

Voice over IP Fundamentals

Voice over IP Fundamentals Voice over IP Fundamentals Duration: 5 Days Course Code: GK3277 Overview: The aim of this course is for delegates to gain essential data networking and Voice over IP (VoIP) knowledge in a single, week-long

More information

Overview of Voice Over Internet Protocol

Overview of Voice Over Internet Protocol Overview of Voice Over Internet Protocol Purva R. Rajkotia, Samsung Electronics November 4,2004 Overview of Voice Over Internet Protocol Presentation Outline History of VoIP What is VoIP? Components of

More information

Integrating Voice over IP services in IPv4 and IPv6 networks

Integrating Voice over IP services in IPv4 and IPv6 networks ARTICLE Integrating Voice over IP services in IPv4 and IPv6 networks Lambros Lambrinos Dept.of Communication and Internet studies Cyprus University of Technology Limassol 3603, Cyprus lambros.lambrinos@cut.ac.cy

More information

Connect your Control Desk to the SIP world

Connect your Control Desk to the SIP world Connect your Control Desk to the SIP world Systems in

More information

Optimizing Converged Cisco Networks (ONT)

Optimizing Converged Cisco Networks (ONT) Optimizing Converged Cisco Networks (ONT) Module 2: Cisco VoIP Implementations (Deploy) Calculating Bandwidth Requirements for VoIP Objectives Describe factors influencing encapsulation overhead and bandwidth

More information

Connecting Your Enterprise With Asterisk: IAX to Carriers. Dayton Turner Voxter Communications

Connecting Your Enterprise With Asterisk: IAX to Carriers. Dayton Turner Voxter Communications Connecting Your Enterprise With Asterisk: IAX to Carriers Dayton Turner Voxter Communications What is IAX? Inter Asterisk exchange Developed by Digium and the Open Source Community Alternative to SIP,

More information

Application Note. Onsight Connect Network Requirements V6.1

Application Note. Onsight Connect Network Requirements V6.1 Application Note Onsight Connect Network Requirements V6.1 1 ONSIGHT CONNECT SERVICE NETWORK REQUIREMENTS... 3 1.1 Onsight Connect Overview... 3 1.2 Onsight Connect Servers... 4 Onsight Connect Network

More information

SIP Essentials Training

SIP Essentials Training SIP Essentials Training 5 Day Course Lecture & Labs COURSE DESCRIPTION Learn Session Initiation Protocol and important protocols related to SIP implementations. Thoroughly study the SIP protocol through

More information

Voice over IP (VoIP) and QoS/QoE

Voice over IP (VoIP) and QoS/QoE Voice over IP (VoIP) and QoS/QoE Professor Richard Harris School of Engineering and Advanced Technology (SEAT) Presentation Outline Understanding jitter and methods to overcome problems with jitter Quality

More information

WHAT S BEHIND YOUR SMARTPHONE ICONS? A brief tour of behind-the-scenes signaling for multimedia services

WHAT S BEHIND YOUR SMARTPHONE ICONS? A brief tour of behind-the-scenes signaling for multimedia services WHAT S BEHIND YOUR SMARTPHONE ICONS? A brief tour of behind-the-scenes signaling for multimedia services Harry G. Perros Computer Science Department NC State University, Raleigh 27695 USA Email: hp@ncsu.edu

More information

How to make free phone calls and influence people by the grugq

How to make free phone calls and influence people by the grugq VoIPhreaking How to make free phone calls and influence people by the grugq Agenda Introduction VoIP Overview Security Conclusion Voice over IP (VoIP) Good News Other News Cheap phone calls Explosive growth

More information

VoIP & Internet Telephony

VoIP & Internet Telephony VoIP & Internet Telephony Peter Gradwell www.gradwell.com 01225 800 800 3-3a Gloucester St, Bath, BA1 2SE www.gradwell.com 1 Gradwell dot com Ltd Founded 1998 whilst at University 7 Staff Bath, Bristol,

More information

Voice over IP Manual

Voice over IP Manual Voice over IP Manual 2 IP Manual General Information Introduction The UNIVERGE system uses IP for various applications. This section describes the procedure for connecting the UNIVERGE system to an existing

More information

Comparison of Voice over IP with circuit switching techniques

Comparison of Voice over IP with circuit switching techniques Comparison of Voice over IP with circuit switching techniques Author Richard Sinden Richard Sinden 1 of 9 Abstract Voice-over-IP is a growing technology. Companies are beginning to consider commercial

More information

Integrate VoIP with your existing network

Integrate VoIP with your existing network Integrate VoIP with your existing network As organisations increasingly recognise and require the benefits voice over Internet Protocol (VoIP) offers, they stop asking "Why?" and start asking "How?". A

More information

Chapter 2 PSTN and VoIP Services Context

Chapter 2 PSTN and VoIP Services Context Chapter 2 PSTN and VoIP Services Context 2.1 SS7 and PSTN Services Context 2.1.1 PSTN Architecture During the 1990s, the telecommunication industries provided various PSTN services to the subscribers using

More information

SIP : Session Initiation Protocol

SIP : Session Initiation Protocol : Session Initiation Protocol EFORT http://www.efort.com (Session Initiation Protocol) as defined in IETF RFC 3261 is a multimedia signaling protocol used for multimedia session establishment, modification

More information

IP Telephony with Asterisk. Sunday A. Folayan

IP Telephony with Asterisk. Sunday A. Folayan IP Telephony with Asterisk Sunday A. Folayan There lived the PSTN. A few years ago, everyone struggled to convert data (IP) into sound, and move it over the Public Switched Telephone Network (PSTN) infrastructure

More information

SIP Trunking. Service Guide. www.megapath.com. Learn More: Call us at 877.634.2728.

SIP Trunking. Service Guide. www.megapath.com. Learn More: Call us at 877.634.2728. Service Guide Learn More: Call us at 877.634.2728. www.megapath.com What is MegaPath SIP Trunking? SIP Trunking enables your business to reduce costs and simplify IT management by combining voice and Internet

More information

NAT and Firewall Traversal with STUN / TURN / ICE

NAT and Firewall Traversal with STUN / TURN / ICE NAT and Firewall Traversal with STUN / TURN / ICE Simon Perreault Viagénie {mailto sip}:simon.perreault@viagenie.ca http://www.viagenie.ca Credentials Consultant in IP networking and VoIP at Viagénie.

More information

159.334 Computer Networks. Voice over IP (VoIP) Professor Richard Harris School of Engineering and Advanced Technology (SEAT)

159.334 Computer Networks. Voice over IP (VoIP) Professor Richard Harris School of Engineering and Advanced Technology (SEAT) Voice over IP (VoIP) Professor Richard Harris School of Engineering and Advanced Technology (SEAT) Presentation Outline Basic IP phone set up The SIP protocol Computer Networks - 1/2 Learning Objectives

More information

5. DEPLOYMENT ISSUES Having described the fundamentals of VoIP and underlying IP infrastructure, let s address deployment issues.

5. DEPLOYMENT ISSUES Having described the fundamentals of VoIP and underlying IP infrastructure, let s address deployment issues. 5. DEPLOYMENT ISSUES Having described the fundamentals of VoIP and underlying IP infrastructure, let s address deployment issues. 5.1 LEGACY INTEGRATION In most cases, enterprises own legacy PBX systems,

More information

White Paper. D-Link International Tel: (65) 6774 6233, Fax: (65) 6774 6322. E-mail: info@dlink.com.sg; Web: http://www.dlink-intl.

White Paper. D-Link International Tel: (65) 6774 6233, Fax: (65) 6774 6322. E-mail: info@dlink.com.sg; Web: http://www.dlink-intl. Introduction to Voice over Wireless LAN (VoWLAN) White Paper D-Link International Tel: (65) 6774 6233, Fax: (65) 6774 6322. Introduction Voice over Wireless LAN (VoWLAN) is a technology involving the use

More information

Encapsulating Voice in IP Packets

Encapsulating Voice in IP Packets Encapsulating Voice in IP Packets Major VoIP Protocols This topic defines the major VoIP protocols and matches them with the seven layers of the OSI model. Major VoIP Protocols 15 The major VoIP protocols

More information

Application Note. Firewall Requirements for the Onsight Mobile Collaboration System and Hosted Librestream SIP Service v5.0

Application Note. Firewall Requirements for the Onsight Mobile Collaboration System and Hosted Librestream SIP Service v5.0 Application Note Firewall Requirements for the Onsight Mobile Collaboration System and Hosted Librestream SIP Service v5.0 1 FIREWALL REQUIREMENTS FOR ONSIGHT MOBILE VIDEO COLLABORATION SYSTEM AND HOSTED

More information

SIP Trunking Application Notes V1.3

SIP Trunking Application Notes V1.3 SIP Trunking Application Notes V1.3 Publication Information SAMSUNG TELECOMMUNICATIONS AMERICA reserves the right without prior notice to revise information in this publication for any reason. SAMSUNG

More information

Session Initiation Protocol (SIP) The Emerging System in IP Telephony

Session Initiation Protocol (SIP) The Emerging System in IP Telephony Session Initiation Protocol (SIP) The Emerging System in IP Telephony Introduction Session Initiation Protocol (SIP) is an application layer control protocol that can establish, modify and terminate multimedia

More information

VoIP Analysis Fundamentals with Wireshark. Phill Shade (Forensic Engineer Merlion s Keep Consulting)

VoIP Analysis Fundamentals with Wireshark. Phill Shade (Forensic Engineer Merlion s Keep Consulting) VoIP Analysis Fundamentals with Wireshark Phill Shade (Forensic Engineer Merlion s Keep Consulting) 1 Phillip D. Shade (Phill) phill.shade@gmail.com Phillip D. Shade is the founder of Merlion s Keep Consulting,

More information

Cisco Networks (ONT) 2006 Cisco Systems, Inc. All rights reserved.

Cisco Networks (ONT) 2006 Cisco Systems, Inc. All rights reserved. Optimizing Converged Cisco Networks (ONT) reserved. Lesson 2.4: Calculating Bandwidth Requirements for VoIP reserved. Objectives Describe factors influencing encapsulation overhead and bandwidth requirements

More information

NAT TCP SIP ALG Support

NAT TCP SIP ALG Support The feature allows embedded messages of the Session Initiation Protocol (SIP) passing through a device that is configured with Network Address Translation (NAT) to be translated and encoded back to the

More information

VoIP Overview for Operators. Gene Lew VP, Advanced Services NANOG 34 Seattle, Washington May 2005

VoIP Overview for Operators. Gene Lew VP, Advanced Services NANOG 34 Seattle, Washington May 2005 VoIP Overview for Operators Gene Lew VP, Advanced Services NANOG 34 Seattle, Washington May 2005 VoIP World IP networks enable creation of virtual phone companies Potential for anyone to be their own phone

More information

nexvortex SIP Trunking Implementation & Planning Guide V1.5

nexvortex SIP Trunking Implementation & Planning Guide V1.5 nexvortex SIP Trunking Implementation & Planning Guide V1.5 510 S PRING S TREET H ERNDON VA 20170 +1 855.639.8888 Introduction Welcome to nexvortex! This document is intended for nexvortex Customers and

More information

Receiving the IP packets Decoding of the packets Digital-to-analog conversion which reproduces the original voice stream

Receiving the IP packets Decoding of the packets Digital-to-analog conversion which reproduces the original voice stream Article VoIP Introduction Internet telephony refers to communications services voice, fax, SMS, and/or voice-messaging applications that are transported via the internet, rather than the public switched

More information

Communication Systems SIP

Communication Systems SIP Communication Systems SIP Computer Science Organization I. Data and voice communication in IP networks II. Security issues in networking III. Digital telephony networks and voice over IP 2 Part 3 Digital,

More information

internet technologies and standards

internet technologies and standards Institute of Telecommunications Warsaw University of Technology 2015 internet technologies and standards Piotr Gajowniczek Andrzej Bąk Michał Jarociński multimedia in the Internet Voice-over-IP multimedia

More information

Internet Services & Protocols Multimedia Applications, Voice over IP

Internet Services & Protocols Multimedia Applications, Voice over IP Department of Computer Science Institute for System Architecture, Chair for Computer Networks Internet Services & Protocols Multimedia Applications, Voice over IP Dipl.-Inform. Stephan Groß Room: GRU314

More information

Application Note. Pre-Deployment and Network Readiness Assessment Is Essential. Types of VoIP Performance Problems. Contents

Application Note. Pre-Deployment and Network Readiness Assessment Is Essential. Types of VoIP Performance Problems. Contents Title Six Steps To Getting Your Network Ready For Voice Over IP Date January 2005 Overview This provides enterprise network managers with a six step methodology, including predeployment testing and network

More information

Packetized Telephony Networks

Packetized Telephony Networks Packetized Telephony Networks Benefits of Packet Telephony Networks Traditionally, the potential savings on long-distance costs was the driving force behind the migration to converged voice and data networks.

More information

EarthLink Business SIP Trunking. NEC SV8100 IP PBX Customer Configuration Guide

EarthLink Business SIP Trunking. NEC SV8100 IP PBX Customer Configuration Guide EarthLink Business SIP Trunking NEC SV8100 IP PBX Customer Configuration Guide Publication History First Release: Version 1.0 August 30, 2011 CHANGE HISTORY Version Date Change Details Changed By 1.0 8/30/2011

More information

IP Telephony (Voice over IP)

IP Telephony (Voice over IP) (Voice over IP) Instructor Ai-Chun Pang, acpang@csie.ntu.edu.tw Office Number: 417, New building of CSIE Textbook Carrier Grade Voice over IP, D. Collins, McGraw-Hill, Second Edition, 2003. Requirements

More information

Presented by: John Downing, B.Eng, MBA, P.Eng

Presented by: John Downing, B.Eng, MBA, P.Eng Presented by: John Downing, B.Eng, MBA, P.Eng John Downing co-founder of TrainingCity. VoIP Training Development Lead. VoIP & SIP Consultant to Telecom & Enterprise Clients. John@TrainingCity.com 613-435-1170

More information

B12 Troubleshooting & Analyzing VoIP

B12 Troubleshooting & Analyzing VoIP B12 Troubleshooting & Analyzing VoIP Phillip Sherlock Shade, Senior Forensics / Network Engineer Merlion s Keep Consulting phill.shade@gmail.com Phillip Sherlock Shade (Phill) phill.shade@gmail.com Phillip

More information

FOSDEM 2007 Brussels, Belgium. Daniel Pocock B.CompSc(Melbourne) www.readytechnology.co.uk

FOSDEM 2007 Brussels, Belgium. Daniel Pocock B.CompSc(Melbourne) www.readytechnology.co.uk Open Source VoIP on Debian FOSDEM 2007 Brussels, Belgium Daniel Pocock B.CompSc(Melbourne) www.readytechnology.co.uk Overview User expectations How it works Survey of available software Overview of resiprocate

More information

Network Simulation Traffic, Paths and Impairment

Network Simulation Traffic, Paths and Impairment Network Simulation Traffic, Paths and Impairment Summary Network simulation software and hardware appliances can emulate networks and network hardware. Wide Area Network (WAN) emulation, by simulating

More information

Media Gateway Controller RTP

Media Gateway Controller RTP 1 Softswitch Architecture Interdomain protocols Application Server Media Gateway Controller SIP, Parlay, Jain Application specific Application Server Media Gateway Controller Signaling Gateway Sigtran

More information

Application Notes Rev. 1.0 Last Updated: January 9, 2015

Application Notes Rev. 1.0 Last Updated: January 9, 2015 SBC 1000/2000 Series Configuration Guide with Cisco Unified Call Manager v9.1 for Level 3 Voice Complete SM SIP Trunk Deployments Application Notes Rev. 1.0 Last Updated: January 9, 2015 Contents 1 Document

More information

AT&T IP Flex Reach/ IP Toll Free Configuration Guide IC 3.0 with Interaction SIP Proxy

AT&T IP Flex Reach/ IP Toll Free Configuration Guide IC 3.0 with Interaction SIP Proxy INTERACTIVE INTELLIGENCE AT&T IP Flex Reach/ IP Toll Free Configuration Guide IC 3.0 with Interaction SIP Proxy Version 1.7 9/2/2009 TABLE OF CONTENTS 1 AT&T... 5 1.1 Introduction... 5 1.2 Product Descriptions...

More information

Voice Over IP. www.lauraknapp.com. Tom Hadley Network Consultant 1-919-787-5999 tom@lauraknapp.com

Voice Over IP. www.lauraknapp.com. Tom Hadley Network Consultant 1-919-787-5999 tom@lauraknapp.com Voice Over IP IBM Tom Hadley Network Consultant 1-919-787-5999 tom@lauraknapp.com www.lauraknapp.com Networking - Connecting people to information through technology Laura Jeanne Knapp IBM Technical Evangelist

More information

VoIP for Network Operators. Andy Davidson NANOG 44, October 2008

VoIP for Network Operators. Andy Davidson NANOG 44, October 2008 VoIP for Network Operators Andy Davidson NANOG 44, October 2008 Motivation / Aim Help IP network professionals make good VoIP networks Agenda VoIP basics What operators need to know when building VoIP

More information

Enterprise Video Conferencing

Enterprise Video Conferencing Enterprise Video Conferencing When Voice Meets Video How SIP & H.323 Can Coexist SIPNOC 2014 Presented by: Gernot Scheichl June 2014 Agenda The Market The Challenges History Comparing the Protocols (H.323

More information

VoIP technology employs several network protocols such as MGCP, SDP, H323, SIP.

VoIP technology employs several network protocols such as MGCP, SDP, H323, SIP. 1 VoIP support configuration First used in the mid-1990s, VoIP is an emerging technology for telephone calls and other data transfer. The concept is relatively simple: Use the multiple networks that comprise

More information

Development of SIP-H.323 Gateway Project

Development of SIP-H.323 Gateway Project Development of SIP-H.323 Gateway Project Ruston Hutchens QUESTnet 2005 Thursday 7 th July v2 SIP-H.323 Gateway project Motivation Large deployment base of H.323 terminals (over 2.9 million calls placed

More information

Troubleshooting Voice Over IP with WireShark

Troubleshooting Voice Over IP with WireShark Hands-On Course Description Voice over IP is being widely implemented both within companies and across the Internet. The key problems with IP voice services are maintaining the quality of the voice service

More information

Hands on VoIP. Content. Tel +44 (0) 845 057 0176 enquiries@protelsolutions.co.uk. Introduction

Hands on VoIP. Content. Tel +44 (0) 845 057 0176 enquiries@protelsolutions.co.uk. Introduction Introduction This 4-day course offers a practical introduction to 'hands on' VoIP engineering. Voice over IP promises to reduce your telephony costs and provides unique opportunities for integrating voice

More information

Internet Services & Protocols Multimedia Applications, Voice over IP

Internet Services & Protocols Multimedia Applications, Voice over IP Department of Computer Science Institute for System Architecture, Chair for Computer Networks Internet Services & Protocols Multimedia Applications, Voice over IP Dr.-Ing. Stephan Groß Room: INF 3099 E-Mail:

More information

Clearing the Way for VoIP

Clearing the Way for VoIP Gen2 Ventures White Paper Clearing the Way for VoIP An Alternative to Expensive WAN Upgrades Executive Overview Enterprises have traditionally maintained separate networks for their voice and data traffic.

More information

The use of IP networks, namely the LAN and WAN, to carry voice. Voice was originally carried over circuit switched networks

The use of IP networks, namely the LAN and WAN, to carry voice. Voice was originally carried over circuit switched networks Voice over IP Introduction VoIP Voice over IP The use of IP networks, namely the LAN and WAN, to carry voice Voice was originally carried over circuit switched networks PSTN (Public Switch Telephone Network)

More information

12 Quality of Service (QoS)

12 Quality of Service (QoS) Burapha University ก Department of Computer Science 12 Quality of Service (QoS) Quality of Service Best Effort, Integrated Service, Differentiated Service Factors that affect the QoS Ver. 0.1 :, prajaks@buu.ac.th

More information

Application Note How To Determine Bandwidth Requirements

Application Note How To Determine Bandwidth Requirements Application Note How To Determine Bandwidth Requirements 08 July 2008 Bandwidth Table of Contents 1 BANDWIDTH REQUIREMENTS... 1 1.1 VOICE REQUIREMENTS... 1 1.1.1 Calculating VoIP Bandwidth... 2 2 VOIP

More information

Dialogic Diva SIPcontrol Software

Dialogic Diva SIPcontrol Software Dialogic Diva SIPcontrol Software converts Dialogic Diva Media Boards (Universal and V-Series) into SIP-enabled PSTN-IP gateways. The boards support a variety of TDM protocols and interfaces, ranging from

More information

Application Notes Rev. 1.0 Last Updated: February 3, 2015

Application Notes Rev. 1.0 Last Updated: February 3, 2015 SBC 1000/2000 Series Configuration Guide with Cisco Unified Call Manager v8.6 for Level 3 Voice Complete SM Deployments Application Notes Rev. 1.0 Last Updated: February 3, 2015 Contents 1 Document Overview...

More information