TECHNICAL CHALLENGES OF VoIP BYPASS

Save this PDF as:
 WORD  PNG  TXT  JPG

Size: px
Start display at page:

Download "TECHNICAL CHALLENGES OF VoIP BYPASS"

Transcription

1 TECHNICAL CHALLENGES OF VoIP BYPASS Presented by Monica Cultrera VP Software Development Bitek International Inc 23 rd TELELCOMMUNICATION CONFERENCE

2 Agenda 1. Defining VoIP What is VoIP? How to establish a VoIP call 2. VoIP Protocols H.323 SIP SKYPE 3. Impact of VoIP on Networks Bandwidth consumption Bandwidth used by voice 4. Network Management of VoIP Attempted Solutions adopted against VoIP and VPN 5. Questions and Answers Private and Confidential 2

3 TECHNICAL CHALLENGES OF VoIP BYPASS 1. Defining VoIP 23 rd TELELCOMMUNICATION CONFERENCE

4 Defining VoIP What is VoIP? VoIP = Voice over Internet Protocol, is the routing of a voice conversation over the Internet or through an IP-based network PSTN VoIP Traffic PSTN Cell Cell Cell Via WiFi Wireless Hot Spot IP network 1 IP network 2 Wireless Hot Spot Lap Top Via WiFi PDA Via WiFi Private and Confidential 4

5 Defining VoIP Attributes of VoIP PRO s CON s Location independent Cheap or free calls Free phone number in different areas Additional features Integration of additional services available on the Internet No Emergency calls QoS not guaranteed Reliability Inconsistent User Experience Multiple Protocols Private and Confidential 5

6 Defining VoIP What are the issues relating to VoIP? Providing consistent Quality of Service - QoS Routing traffic through firewalls and NAT Some VoIP protocols like Skype use proprietary protocols Some VoIP protocols use STUN through NATs and ICE STUN: UDP: NAT: ICE: Simple Traversal of UDP through NAT User Datagram Protocol Network Address Translation Interactive Connectivity Establishment Private and Confidential 6

7 Defining VoIP Peer-to-Peer VoIP Calls The call is a the shortest route or a direct connection between two users 1 - A calls B Client A 3 - VoIP Session Established Client B 2 - B accepts call Private and Confidential 7

8 Defining VoIP VoIP Calls via Proxy The call is established using a Proxy Server All Clients are registered in the Proxy Server 1 - A sends a CALL REQUEST to B to the Proxy 2 - Proxy sends B s info to A Proxy Server Proxy Maintains Connection Proxy Maintains Connection 2 - Proxy sends A s info to B Client C Client A 3 - Call between A & B Client B Private and Confidential 8

9 TECHNICAL CHALLENGES OF VoIP BYPASS 2. VoIP Protocols 23 rd TELELCOMMUNICATION CONFERENCE TECHNICAL CHALLENGES OF VoIP BYPASS

10 VoIP Protocol - Sequences What is required to establish a VoIP call? VoIP uses different Protocols to route packets, implement the call and create a conversation over the Internet: 1. Signalling Protocol: Creates the session. e.g. SIP and Q931 (for H323) 2. Session Description Protocol: Establishes the available media and typically negotiates the codec to be used. e.g. SDP used commonly by SIP or H245 used by H Voice Transport Protocol: For real-time voice transport (RTP) used with RTCP (Real-time Transport Control Protocol) for quality, synchronisation and identity management Softphones must use protocols to establish a VoIP Session Private and Confidential 10

11 VoIP Protocols What are the most common protocols? The two most used VoIP standard protocols are H323 and SIP H.323 was the first to be developed SIP has surpassed H.323 for better traversal NAT and firewalls 85% of the Softphones use SIP (Messenger, Vonage,etc.) Proprietary protocols are created by new softphone companies SKYPE is the most successful example Private and Confidential 11

12 VoIP Protocols H.323 s Background In 1986 ITU ratified first version of protocol H323 H323 defines how Voice, Data and Video are carried using IP H323 pioneered the linking of different endpoints H323 coordinates the supporting protocols to establish the session: RAS to manage registration, admission, status Q.931 to manage call set up and termination H.245 to negotiate channel usage and capabilities Private and Confidential 12

13 VoIP Protocols H.323 Set Up of a H.323 call Gatekeeper Admission Request Client A Admission Confirm Setup Call Proceeding Admission Request Client B Admission Confirm Alert Connecting Terminal Capability Set Open Logical Channel RAS H225 H245 Voice Media (Voice) Private and Confidential 13

14 VoIP Protocols H.323 Termination of a H.323 call Media (Voice) Client A End Session Command Close Logical Channel End Session Command Close Logical Channel Client B Release Complete Disengage Request Disengage Confirm Disengage Request Disengage Confirm RAS H225 H245 Voice Gatekeeper Private and Confidential 14

15 VoIP Protocols - SIP SIP s Background Originally defined by IETF with the RFC3261, the Session Initiation Protocol (SIP) is an application-layer control protocol that can establish, modify and terminate multimedia sessions (conferences) such as Internet telephony calls SIP works independently of underlying transport protocols and without dependency on the type of session that is being established The protocol commonly used for describing Media is SDP IETF: Internet Engineering Task Force SDP: Session Description Protocol Private and Confidential 15

16 Protocols - SIP Set up and termination of SIP call Alice 1. Invite Trying Ringing OK Proxy wonderland.com 2. Invite Trying Ringing OK Proxy whiterabbit.com 4. Invite Ringing OK Peter 12. ACK Media Session 13. BYE OK Private and Confidential 16

17 VoIP Protocols What are the differences between SIP and H.323? Architecture: - H323 Softphones cover the services within the confines of the protocol + SIP allows variants and service development for Softphones adaptation Message Encoding = H323 is binary encoded therefore efficient for network = SIP is text based so human-readable but bulky for the network PSTN Internetworking + H323 structure is inherited by PSTN protocols (e.g. Q.931) - SIP has no commonality with PSTN Private and Confidential 17

18 VoIP Protocols - Skype Skype Skype is an encrypted P2P service using proprietary protocol P2P Internet Telephony network created by Niklas Zennstrom and Jan Friis (founders of KaZaa) Skype is rapidly challenging the SIP & H323 standard based softphones Private and Confidential 18

19 VoIP Protocols - Skype Skype Architecture SN SuperNode Active connection SN SN Backup connection SN connection SN SN Skype Client SN Skype Client Private and Confidential 19

20 VoIP Protocols - Skype How does Skype work? Skype connects by using a randomly generated TCP port or UDP port, if this one is blocked, it will find another Skype mimics protocols of secure authentication, making its identification almost impossible Skype is always ON and consequently always active with its SuperNodes Skype uses bandwidth regardless of call status SuperNodes use the most bandwidth Private and Confidential 20

21 TECHNICAL CHALLENGES OF VoIP BYPASS 3. Impact of VoIP on Networks 23 rd TELELCOMMUNICATION CONFERENCE BANDWIDTH CONSUMPTION

22 Impact of VoIP on Networks Summary In this section Impact of VoIP on Networks : Bandwidth consumption Bandwidth used by voice Codec IP & Transmission headers Packet and frame Private and Confidential 22

23 Impact of VoIP on Networks Bandwidth consumption VoIP is "new" traffic, adding load to the network that was initially not planned for Resource Management is required to differentiate the user groups of VoIP QoS monitoring is required to ensure SLA to actual customers Unauthorised VoIP adds load and latency to network Private and Confidential 23

24 Impact of VoIP on Networks How Bandwidth is Increased by Voice Packets The amount of bandwidth required for carrying voice depends on: 1. Voice determined by Codec: the process of converting analogue voice into a digital format 2. IP & Transmission header: containing data instructions for routing the voice packet Different Codec uses different bandwidth The Codec actually determines how much bandwidth the voice data occupies Private and Confidential 24

25 Impact of VoIP on Networks Codec Codec samples the voice (at a rate of approximately 8000 samples per second) and generates a value for each sample These values create the voice frame To establish the size of a voice frame: Number of bits produced per second Sample period to determine how often transmit G.711 samples every 20ms and produces 64kbps G.729 samples every 10ms and produces 8kbps 20ms = 50 frames per second / 50 = 1280 bit per single frame (160 bytes) 10ms = 100 frames per second 8000 / 100 = 80 bit per single frame (10 bytes) Private and Confidential 25

26 Impact of VoIP on Networks IP & Transmission Headers The voice (carried inside the payload) is wrapped in different layers: IP: contains source and destination host UDP: contains source and destination port RTP: contains info on how to reconstruct the samples in the correct order 40 bytes to be added on top of the payload The IP packet is wrapped in another layer by the physical transmission medium. Ethernet adds an additional 38 Bytes IP UDP RTP Ethernet Preamble & Headers IP headers Voice CRC & Ethernet Gap Private and Confidential 26

27 Impact of VoIP on Networks G.711 sampling every 20ms Ethernet 38 bytes 304 bit 15.2 kbps IP 40 bytes 320 bit 16 kbps Voice 160 bytes 1280 bit 64 kbps Total 238 bytes 1904 bit 95.2 kbps For both streams of the call, the bandwidth consumption is kbps G.729 sampling every 10ms Ethernet 38 bytes 304 bit 30.4 kbps IP 40 bytes 320 bit 32 kbps Voice 10 bytes 80 bit 8 kbps Total 88 bytes 704 bit 70.4 kbps For both streams of the call, the bandwidth consumption is kbps Private and Confidential 27

28 Impact of VoIP on Networks Packet and Frame Many softphones send a single frame per packet Sending more frames per packet reduces packet transmission overhead (better for network) Sending less frames per packet reduces voice latency (better for VoIP Providers) A trade-off between call quality (in the interest of VoIP providers) & latency of the network Shorter samples = smaller the frame, voice quality vs packet header bigger than voice The network is used to carry meaningless packets G.711 the Voice data is 160B per frame on a total of 238B (50 packets per second) G.729 the Voice data is 10B per frame on a total of 88B (100 packets per second) Private and Confidential 28

29 TECHNICAL CHALLENGES OF VoIP BYPASS 4. Network Management of VoIP Attempted Solutions to Bypass VoIP. 23 rd TELELCOMMUNICATION CONFERENCE NETWORK MANAGEMENT OPTIONS

30 False Solutions Port Blocking will not stop Bypass VoIP False Solution: Closing Specific Ports (e.g for SIP and 1720 for H.323) Problems: Must re-route own VoIP Must monitor constantly as Bypass VoIP is redirected manually Softphones randomly change the ports used Grey Operators modify code slightly from the standard to disguise VoIP traffic Private and Confidential 30

31 False Solutions Bandwidth Control will not stop Bypass VoIP False solution Attempts to carry out the following: Prioritising VoIP to lower QoS levels Adding Latency Adding Noise Adding Jitter Problems These solutions just delay the VoIP problem and create issues with own VoIP Voice reconstruction New softphones / Bypass Operators would change the codec used for voice or could move to TCPNODELAY for carrying voice and signalling Private and Confidential 31

32 VoIP Bypass Strategy VPN s Bypass Port Blocking and Bandwidth Control A Virtual Private Network (VPN) is a private network established within a public network to communicate confidentially Originally VPN has been designed for companies or organizations that needed to work and transmit information confidentially Now this tool is exploited to cross all network restrictions Even person to person can create a VPN tunnel to an international toll free VoIP call Private and Confidential 32

33 Real Solution Implications of Controlling the VPN Bitek R&D teams have proven that a Technical Solution is Possible to resolve VPN in the same way as Bitek controls Skype and other VoIP, but.. Legal implication - breaching confidentiality potentially invading customer data (everything is encrypted) Public Relations issues admitting to customers that they are being controlled within a secure link Public debate Where does privacy end and security start? THIS IS NOT ONLY A TECHNICAL ISSUE! Private and Confidential 33

34 Technical Conclusion The real solution does not lie within the network VoIP Bypass, Grey Traffic and Softphone Control, Revenue Creation and Protection are BATTLES FOUGHT AND WON ON THE PACKET LEVEL Fortunately, the solution exists! Private and Confidential 34

35 5. Questions and Answers Thank you Members of CANTO Monica Cultrera VP Software Development 23 rd TELELCOMMUNICATION CONFERENCE

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

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

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

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

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

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

VoIP Bandwidth Calculation

VoIP Bandwidth Calculation VoIP Bandwidth Calculation AI0106A VoIP Bandwidth Calculation Executive Summary Calculating how much bandwidth a Voice over IP call occupies can feel a bit like trying to answer the question; How elastic

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

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

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

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

Voice over IP (VoIP) Overview. Introduction. David Feiner ACN 2004. Introduction VoIP & QoS H.323 SIP Comparison of H.323 and SIP Examples

Voice over IP (VoIP) Overview. Introduction. David Feiner ACN 2004. Introduction VoIP & QoS H.323 SIP Comparison of H.323 and SIP Examples Voice over IP (VoIP) David Feiner ACN 2004 Overview Introduction VoIP & QoS H.323 SIP Comparison of H.323 and SIP Examples Introduction Voice Calls are transmitted over Packet Switched Network instead

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

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

OVERVIEW OF ALL VOIP SOLUTIONS

OVERVIEW OF ALL VOIP SOLUTIONS OVERVIEW OF ALL VOIP SOLUTIONS Kovács Gábor Parnaki Zsolt Gergı 13/03/2009 TABLE OF CONTENTS Introduction Overview of VoIP protocols Standard based implementations: H.323 SIP Proprietary solutions: Skype

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

TSIN02 - Internetworking

TSIN02 - Internetworking TSIN02 - Internetworking Lecture 9: SIP and H323 Literature: Understand the basics of SIP and it's architecture Understand H.323 and how it compares to SIP Understand MGCP (MEGACO/H.248) SIP: Protocol

More information

VOICE over IP H.323 Advanced Computer Network SS2005 Presenter : Vu Thi Anh Nguyet

VOICE over IP H.323 Advanced Computer Network SS2005 Presenter : Vu Thi Anh Nguyet VOICE over IP H.323 Advanced Computer Network SS2005 Presenter : Vu Thi Anh Nguyet 1 Outlines 1. Introduction 2. QoS in VoIP 3. H323 4. Signalling in VoIP 5. Conclusions 2 1. Introduction to VoIP Voice

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

Software Engineering 4C03 VoIP: The Next Telecommunication Frontier

Software Engineering 4C03 VoIP: The Next Telecommunication Frontier Software Engineering 4C03 VoIP: The Next Telecommunication Frontier Rudy Muslim 0057347 McMaster University Computing and Software Department Hamilton, Ontario Canada Introduction Voice over Internet Protocol

More information

CPNI VIEWPOINT 01/2007 INTERNET VOICE OVER IP

CPNI VIEWPOINT 01/2007 INTERNET VOICE OVER IP INTERNET VOICE OVER IP AUGUST 2007 Abstract Voice over IP (VoIP) is the term used for a set of technologies that enable real time voice or video conversations to take place across IP networks. VoIP devices

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

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

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

Internet Security. Internet Security Voice over IP. Introduction. ETSF10 Internet Protocols 2011-11-22. ETSF10 Internet Protocols 2011

Internet Security. Internet Security Voice over IP. Introduction. ETSF10 Internet Protocols 2011-11-22. ETSF10 Internet Protocols 2011 Internet Security Voice over IP ETSF10 Internet Protocols 2011 Kaan Bür & Jens Andersson Department of Electrical and Information Technology Internet Security IPSec 32.1 SSL/TLS 32.2 Firewalls 32.4 + Voice

More information

Multimedia Communications Voice over IP

Multimedia Communications Voice over IP Multimedia Communications Voice over IP Anandi Giridharan Electrical Communication Engineering, Indian Institute of Science, Bangalore 560012, India Voice over IP (Real time protocols) Internet Telephony

More information

Secure VoIP Transmission through VPN Utilization

Secure VoIP Transmission through VPN Utilization Secure VoIP Transmission through VPN Utilization Prashant Khobragade Department of Computer Science & Engineering RGCER Nagpur, India prashukhobragade@gmail.com Disha Gupta Department of Computer Science

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

VegaStream Information Note Considerations for a VoIP installation

VegaStream Information Note Considerations for a VoIP installation VegaStream Information Note Considerations for a VoIP installation To get the best out of a VoIP system, there are a number of items that need to be considered before and during installation. This document

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

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

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

EE4607 Session Initiation Protocol

EE4607 Session Initiation Protocol EE4607 Session Initiation Protocol Michael Barry michael.barry@ul.ie william.kent@ul.ie Outline of Lecture IP Telephony the need for SIP Session Initiation Protocol Addressing SIP Methods/Responses Functional

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

Overview of VoIP Systems

Overview of VoIP Systems 2 Overview of VoIP Systems In their simplest form, Voice over IP protocols simply enable two (or more) devices to transmit and receive real-time audio traffic that allows their respective users to communicate.

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

IP Ports and Protocols used by H.323 Devices

IP Ports and Protocols used by H.323 Devices IP Ports and Protocols used by H.323 Devices Overview: The purpose of this paper is to explain in greater detail the IP Ports and Protocols used by H.323 devices during Video Conferences. This is essential

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

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

Network Considerations for IP Video

Network Considerations for IP Video Network Considerations for IP Video H.323 is an ITU standard for transmitting voice and video using Internet Protocol (IP). It differs from many other typical IP based applications in that it is a real-time

More information

Lehrstuhl für Informatik 4 Kommunikation und verteilte Systeme

Lehrstuhl für Informatik 4 Kommunikation und verteilte Systeme Chapter 2: Representation of Multimedia Data Chapter 3: Multimedia Systems Communication Aspects and Services Multimedia Applications and Communication Protocols Quality of Service and Resource Management

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

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

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

VOICE OVER IP (VOIP) TO ENTERPRISE USERS GIOTIS KONSTANTINOS

VOICE OVER IP (VOIP) TO ENTERPRISE USERS GIOTIS KONSTANTINOS VOICE OVER IP (VOIP) TO ENTERPRISE USERS GIOTIS KONSTANTINOS Master of Science in Networking and Data Communications THESIS Thesis Title Voice over IP (VoIP) to Enterprise Users Dissertation submitted

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

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

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

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

Master Kurs Rechnernetze Computer Networks IN2097

Master Kurs Rechnernetze Computer Networks IN2097 Chair for Network Architectures and Services Institute for Informatics TU München Prof. Carle, Dr. Fuhrmann Master Kurs Rechnernetze Computer Networks IN2097 Prof. Dr.-Ing. Georg Carle Dr. Thomas Fuhrmann

More information

VoIP QoS. Version 1.0. September 4, 2006. AdvancedVoIP.com. sales@advancedvoip.com support@advancedvoip.com. Phone: +1 213 341 1431

VoIP QoS. Version 1.0. September 4, 2006. AdvancedVoIP.com. sales@advancedvoip.com support@advancedvoip.com. Phone: +1 213 341 1431 VoIP QoS Version 1.0 September 4, 2006 AdvancedVoIP.com sales@advancedvoip.com support@advancedvoip.com Phone: +1 213 341 1431 Copyright AdvancedVoIP.com, 1999-2006. All Rights Reserved. No part of this

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

A Brief Overview of VoIP Security. By John McCarron. Voice of Internet Protocol is the next generation telecommunications method.

A Brief Overview of VoIP Security. By John McCarron. Voice of Internet Protocol is the next generation telecommunications method. A Brief Overview of VoIP Security By John McCarron Voice of Internet Protocol is the next generation telecommunications method. It allows to phone calls to be route over a data network thus saving money

More information

Implementing VoIP support in a VSAT network based on SoftSwitch integration

Implementing VoIP support in a VSAT network based on SoftSwitch integration Implementing VoIP support in a VSAT network based on SoftSwitch integration Abstract Satellite communications based on geo-synchronous satellites are characterized by a large delay, and high cost of resources.

More information

Internet Technology Voice over IP

Internet Technology Voice over IP Internet Technology Voice over IP Peter Gradwell BT Advert from 1980s Page 2 http://www.youtube.com/v/o0h65_pag04 Welcome to Gradwell Gradwell provides technology for every line on your business card Every

More information

Basic Vulnerability Issues for SIP Security

Basic Vulnerability Issues for SIP Security Introduction Basic Vulnerability Issues for SIP Security By Mark Collier Chief Technology Officer SecureLogix Corporation mark.collier@securelogix.com The Session Initiation Protocol (SIP) is the future

More information

How will the Migration from IPv4 to IPv6 Impact Voice and Visual Communication?

How will the Migration from IPv4 to IPv6 Impact Voice and Visual Communication? How will the Migration from IPv4 to IPv6 Impact Voice and Visual Communication? Nick Hawkins Director, Technology Consulting Polycom, Inc. All rights reserved. Agenda Introduction & standards Requirements

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

Application Note. Onsight TeamLink And Firewall Detect v6.3

Application Note. Onsight TeamLink And Firewall Detect v6.3 Application Note Onsight And Firewall Detect v6.3 1 ONSIGHT TEAMLINK HTTPS TUNNELING SERVER... 3 1.1 Encapsulation... 3 1.2 Firewall Detect... 3 1.2.1 Firewall Detect Test Server Options:... 5 1.2.2 Firewall

More information

Requirements of Voice in an IP Internetwork

Requirements of Voice in an IP Internetwork Requirements of Voice in an IP Internetwork Real-Time Voice in a Best-Effort IP Internetwork This topic lists problems associated with implementation of real-time voice traffic in a best-effort IP internetwork.

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

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

Advanced Networking Voice over IP: RTP/RTCP The transport layer

Advanced Networking Voice over IP: RTP/RTCP The transport layer Advanced Networking Voice over IP: RTP/RTCP The transport layer Renato Lo Cigno Requirements For Real-Time Transmission Need to emulate conventional telephone system Isochronous output timing same with

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

Mixer/Translator VOIP/SIP. Translator. Mixer

Mixer/Translator VOIP/SIP. Translator. Mixer Mixer/Translator VOIP/SIP RTP Mixer, translator A mixer combines several media stream into a one new stream (with possible new encoding) reduced bandwidth networks (video or telephone conference) appears

More information

IP Telephony Deployment Models

IP Telephony Deployment Models CHAPTER 2 Sections in this chapter address the following topics: Single Site, page 2-1 Multisite Implementation with Distributed Call Processing, page 2-3 Design Considerations for Section 508 Conformance,

More information

A Scalable Multi-Server Cluster VoIP System

A Scalable Multi-Server Cluster VoIP System A Scalable Multi-Server Cluster VoIP System Ming-Cheng Liang Li-Tsung Huang Chun-Zer Lee Min Chen Chia-Hung Hsu mcliang@nuk.edu.tw {kpa.huang, chunzer.lee}@gmail.com {minchen, chhsu}@nchc.org.tw Department

More information

VoIP in 802.11. Mika Nupponen. S-72.333 Postgraduate Course in Radio Communications 06/04/2004 1

VoIP in 802.11. Mika Nupponen. S-72.333 Postgraduate Course in Radio Communications 06/04/2004 1 VoIP in 802.11 Mika Nupponen S-72.333 Postgraduate Course in Radio Communications 06/04/2004 1 Contents Introduction VoIP & WLAN Admission Control for VoIP Traffic in WLAN Voice services in IEEE 802.11

More information

VOICE OVER IP SECURITY

VOICE OVER IP SECURITY VOICE OVER IP SECURITY February 2008 The Government of the Hong Kong Special Administrative Region The contents of this document remain the property of, and may not be reproduced in whole or in part without

More information

Alexandre Weffort Thenorio - Data. IP-Telephony

Alexandre Weffort Thenorio - Data. IP-Telephony Alexandre Weffort Thenorio - Data IP-Telephony 1. Introduction... 3 2. What is it?... 4 3. Why IP-Telephony?... 4 3.1. Advantages... 4 3.1.1. Cost... 4 3.1.2. Functionality and Mobility... 4 3.2. Disadvantages...

More information

Methods for Lawful Interception in IP Telephony Networks Based on H.323

Methods for Lawful Interception in IP Telephony Networks Based on H.323 Methods for Lawful Interception in IP Telephony Networks Based on H.323 Andro Milanović, Siniša Srbljić, Ivo Ražnjević*, Darryl Sladden*, Ivan Matošević, and Daniel Skrobo School of Electrical Engineering

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

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

This specification this document to get an official version of this User Network Interface Specification

This specification this document to get an official version of this User Network Interface Specification This specification describes the situation of the Proximus network and services. It will be subject to modifications for corrections or when the network or the services will be modified. Please take into

More information

Voice over IP: RTP/RTCP The transport layer

Voice over IP: RTP/RTCP The transport layer Advanced Networking Voice over IP: /RTCP The transport layer Renato Lo Cigno Requirements For Real-Time Transmission Need to emulate conventional telephone system Isochronous output timing same with input

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

Combining Voice over IP with Policy-Based Quality of Service

Combining Voice over IP with Policy-Based Quality of Service TechBrief Extreme Networks Introduction Combining Voice over IP with Policy-Based Quality of Service Businesses have traditionally maintained separate voice and data networks. A key reason for this is

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

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

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 MPLS Voice VPNs Enabling the Secure Interconnection of Inter-Enterprise VoIP

Connecting MPLS Voice VPNs Enabling the Secure Interconnection of Inter-Enterprise VoIP Connecting MPLS Voice VPNs Enabling the Secure Interconnection of Inter-Enterprise VoIP Connecting MPLS Voice VPNs Enabling the secure interconnection of Inter-Enterprise VoIP Executive Summary: MPLS Virtual

More information

Need for Signaling and Call Control

Need for Signaling and Call Control Need for Signaling and Call Control VoIP Signaling In a traditional voice network, call establishment, progress, and termination are managed by interpreting and propagating signals. Transporting voice

More information

Internet, Part 2. 1) Session Initiating Protocol (SIP) 2) Quality of Service (QoS) support. 3) Mobility aspects (terminal vs. personal mobility)

Internet, Part 2. 1) Session Initiating Protocol (SIP) 2) Quality of Service (QoS) support. 3) Mobility aspects (terminal vs. personal mobility) Internet, Part 2 1) Session Initiating Protocol (SIP) 2) Quality of Service (QoS) support 3) Mobility aspects (terminal vs. personal mobility) 4) Mobile IP Session Initiation Protocol (SIP) SIP is a protocol

More information

Voice over IP. Overview. What is VoIP and how it works. Reduction of voice quality. Quality of Service for VoIP

Voice over IP. Overview. What is VoIP and how it works. Reduction of voice quality. Quality of Service for VoIP Voice over IP Andreas Mettis University of Cyprus November 23, 2004 Overview What is VoIP and how it works. Reduction of voice quality. Quality of Service for VoIP 1 VoIP VoIP (voice over IP - that is,

More information

SIP A Technology Deep Dive

SIP A Technology Deep Dive SIP A Technology Deep Dive Anshu Prasad Product Line Manager, Mitel June 2010 Laith Zalzalah Director, Mitel NetSolutions What is SIP? Session Initiation Protocol (SIP) is a signaling protocol for establishing

More information

Skype characteristics

Skype characteristics Advanced Networking Skype Renato Lo Cigno Credits for part of the original material to Saverio Niccolini NEC Heidelberg Skype characteristics Skype is a well known P2P program for real time communications

More information

Streaming Audio and Video

Streaming Audio and Video Streaming Audio and Video CS 360 Internet Programming Daniel Zappala Brigham Young University Computer Science Department Streaming Audio and Video Daniel Zappala 1/27 Types of Streaming stored audio and

More information

Voice over IP. Abdus Salam ICTP, February 2004 School on Digital Radio Communications for Research and Training in Developing Countries

Voice over IP. Abdus Salam ICTP, February 2004 School on Digital Radio Communications for Research and Training in Developing Countries Voice over IP Abdus Salam ICTP, February 2004 School on Digital Radio Communications for Research and Training in Developing Countries Ermanno Pietrosemoli Latin American Networking School (Fundación EsLaRed)

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

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

point to point and point to multi point calls over IP

point to point and point to multi point calls over IP Helsinki University of Technology Department of Electrical and Communications Engineering Jarkko Kneckt point to point and point to multi point calls over IP Helsinki 27.11.2001 Supervisor: Instructor:

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

SIP, Session Initiation Protocol used in VoIP

SIP, Session Initiation Protocol used in VoIP SIP, Session Initiation Protocol used in VoIP Page 1 of 9 Secure Computer Systems IDT658, HT2005 Karin Tybring Petra Wahlund Zhu Yunyun Table of Contents SIP, Session Initiation Protocol...1 used in VoIP...1

More information

Fundamentos de Voz sobre el protocolo IP (VoIP)

Fundamentos de Voz sobre el protocolo IP (VoIP) Fundamentos de Voz sobre el protocolo IP (VoIP) OBJETIVO: Comprender el entorno de convergencia de redes de voz, datos y video que se está llevando a cabo en las redes de telefonía, identificando las tecnologías

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 SERVICES AND AVIATION DATA NETWORKS

VOICE SERVICES AND AVIATION DATA NETWORKS VOICE SERVICES AND AVIATION DATA NETWORKS Anuj Bhatia, Anant Shah, Nagaraja Thanthry, and Ravi Pendse, Department of Electrical and Computer Engineering, Wichita State University, Wichita KS Abstract The

More information

Special Module on Media Processing and Communication

Special Module on Media Processing and Communication Special Module on Media Processing and Communication Multimedia Communication Fundamentals Dayalbagh Educational Institute (DEI) Dayalbagh Agra PHM 961 Indian Institute of Technology Delhi (IITD) New Delhi

More information

Understanding Voice over IP

Understanding Voice over IP Introduction Understanding Voice over IP For years, many different data networking protocols have existed, but now, data communications has firmly found its home in the form of IP, the Internet Protocol.

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

Voice Over IP Per Call Bandwidth Consumption

Voice Over IP Per Call Bandwidth Consumption Over IP Per Call Bandwidth Consumption Interactive: This document offers customized voice bandwidth calculations with the TAC Bandwidth Calculator ( registered customers only) tool. Introduction Before

More information