4. H.323 Components. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 19

Size: px
Start display at page:

Download "4. H.323 Components. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 19"

Transcription

1 4. H.323 Components VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 19

2 4.1 H.323 Terminals (1/2) H.323 Terminals (2/2) The software IP phone (1/2) The software IP phone (2/2) The hardware IP phone (1/4) The hardware IP phone (2/4) The hardware IP phone (3/4) The hardware IP phone (4/4) The Gatekeeper Main functions of the Gatekeeper Additional functions of the Gatekeeper Das H.323 Gateway (1/4) Das H.323 Gateway (2/4) Das H.323 Gateway (3/4) Das H.323 Gateway (4/4) The MCU (1/2) The MCU (2/2)...19 VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 2 of 19

3 4.1 H.323 Terminals (1/2) The IP phone - also called the H.323 terminal - converts speech from analog to digital format. IP packets carry this digital information through the network. The receiving phone restores the analog signal. Two IP phone versions are available: the H.323 hardphone looks like a standard fixed-line phone. The H.323 softphone is an application running on a PC with headset. Video and Data support is an option in both systems. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 3 of 19

4 4.1 H.323 Terminals (2/2) The structure of an H.323 terminal is standardized and divided into several layers. Each layer has to fulfill a particular task. The lowest layer is represented by the Registration Admission Status (RAS). Its function is to register the terminal with the gatekeeper and control tasks prior to the call. H.225 includes call control messages for call setup and release. The next layer contains H.245. It provides information on which data compression algorithms are available. Additionally the quantity of speech information per IP packet is exchanged between the end points and logical channels for audio transmission are set up. The highest layer contains various audio and video codecs for the conversion and compression of analog voice signals and optional video data. The Receive-Path-Delay-Block or the "Jitter Buffer" ensures a continuous data stream to the codec's input. It arranges the received IP packets in the right order and compensates for delays in transmission. All H.323 terminals support real time, full duplex communication to other H.323 endpoints via a LAN interface using IP. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 4 of 19

5 4.1.1 The software IP phone (1/2) With the help of client software every normal PC can become a LAN phone. A loudspeaker and a microphone complete the equipment. The client emulates a normal telephone and offers a Graphic User Interface (GUI) with configurable layout and functions. These configurations may not only apply to the company or department but also to each individual user. Thus each user may design his GUI to his personal needs almost without limitations, e.g. the number and position of keys for abbreviated dialing can be modified in just a few seconds. Such a wide variety of modification is impossible using standard telephones. The client software is completely integrated into the existing computer environment. Thus each user will find his personal GUI even when he is at a different location or using remote access via the Internet. Various lists are included, e.g. a phone number list and a list of automatic completion of calls to busy subscribers. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 5 of 19

6 4.1.1 The software IP phone (2/2) Microsoft NetMeeting is a widely used application for communicating over the Internet. NetMeeting supports real time communication for both speech and video. In addition, functions like bulletin board, text based chat and file transfer are offered. Using application sharing several users may work e.g. a PowerPoint presentation could be designed in conference, independent of the users location. NetMeeting connects different users via the Internet using IP addresses or an Internet Locater Server (ILS). Because a PC is not always reachable and can also change its IP address, the ILS offers information on subscribers that are currently online. NetMeeting follows the H.323 standard and can be used as an IP softphone in every VoIP environment. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 6 of 19

7 4.1.2 The hardware IP phone (1/4) IP telephony must also be possible without using a software client. A hardware phone is needed if the PC is switched off the user does not accept a PC based phone high availability in case of mains breakdown is important the environment does not allow a software client for any reason The difference between an IP hardware phone and a standard phone is the interface used. Instead of a twisted pair or ISDN interface the IP phone is connected via 10-base-T or 100- base-t. The protocols will also have to change. An IP phone needs TCP/IP and H.323 whereas ISDN protocols can be used in a standard phone. Furthermore the hardware phone compresses voice following G.723 and G.729 respectively. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 7 of 19

8 4.1.2 The hardware IP phone (2/4) One of the biggest advantages of IP telephony is the flexibility in connecting the phones: changing the physical connection of a standard phones does not necessarily change the parameters of the phone to the new outlet. Moving an IP phone from one outlet to another is just a case of disconnecting here and pluging in there, the complete functionality with all parameters remains. The only condition is network access. Most H.323 terminals support either static IP addressing (i.e. IP address is configured manually at the phone) or the dynamic assignment of IP addresses. In the dynamic verison after an IP hardware phone has been connected to the network it has to broadcast a Dynamic Host Configuration Protocol (DHCP) - "Discover" message. The DHCP server receives the message and answers it with a "DHCP-offer". This message contains IP addresses from the servers database which are available for the DHCP-Client. The client accepts the address information by sending a "DHCP-request". The DHCP server acknowledges it with a "DHCP-ACK" containing an IP address and additional options. Then the phone contacts the IP-PBX via TFTP protocol, identifies itself with its unique MAC hardware address or with a user login and gets its profile including its telephone number, PBX extension, keypad layout and activated services. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 8 of 19

9 4.1.2 The hardware IP phone (3/4) Most users need a PC alongside an IP hardware phone at their workspace. Usually a hardware phone includes a hub for connecting the PC. When an Ethernet connection is present the transmission speed is usually negotiated to 100 Mbps half duplex, if an older interface is used the speed might be reduced to 10 Mbps. In the latter case it is useful to have separated network connections for each device. Standard hardware phones from various manufacturers can be equipped with a voice interface. Analog phones, DECT base stations for cordless phones and analog facsimiles machines can be integrated into a Voice over IP environment by using a VoIP terminal adapter. As an IP hardware phone needs an external power input several suppliers of Ethernet switches implement the power supply via switch ports pin 7 and 8, which are not used for data communications. This is known as in-line power supply and follows IEEE-802.3af standard. Furthermore newer IP hardware phones offer switch ports for the IP phone and 100 Mbps Ethernet full duplex instead of an integrated hub. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 9 of 19

10 4.1.2 The hardware IP phone (4/4) An IP hardware phone is made up of several modules. The central element is a microcontroller for signaling. It is responsible for address translation from keypad input to IP address with the help of the gatekeeper. It also takes care of call handling and signaling for call setup and teardown including the negotiation of all necessary parameters. A user interface offers the drivers for display, keypad and ringing tone. A DSP performs voice processing including echo suppression, voice activity detection, voice compression and packaging as well as compensation for jitter, loss of packages and delay variations. The DSP contains a Pulse-Code-Modulation (PCM) interface and a DTMF dual tone multi frequency generator. Other elements in IP hardware phones include a flash memory for software updates and a random access memory RAM. The RJ45 interface to the IP network is a transceiver with an automatically selected data rate of 10 and 100 Mbps. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 10 of 19

11 4.2 The Gatekeeper The Gatekeeper, mostly integrated in gateways or IP PBX, is the brain of a Voice over IP network. As the central element it is responsible for the setup and maintenance of connections. Basically it has the function of the switching matrix in a PBX. The gatekeeper can be seen as a table: each line manages a user with phone number, extension, IP address, status and bandwidth. A Voice over IP network, also called an H.323 network, can be split into several zones, each with a particular number of phones, gateways and MCUs. Each zone needs its own gatekeeper to register the zone members. The zones may be defined by geographical aspects (e.g. branches of a company), by the physical network structure or they may follow the organization chart of a company The gatekeeper processes all activities in a zone. Whenever a zone member becomes activated it sends a registration request to the gatekeeper. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 11 of 19

12 4.2.1 Main functions of the Gatekeeper The gatekeeper supports the following functions: Address translation: All phone numbers dialed with an IP phone have to be translated into an IP address as the user does not normally know the IP address of the B subscriber. With the help of translation tables the gatekeeper changes the alias address like E.164 phone numbers, URLs and addresses into the IP address needed for connection setup. Thus all IP terminals must be registered with the gatekeeper before they can entered into a zone. This registration includes the transmission of IP and alias addresses. Access control: A terminal has to send various signaling information to the gatekeeper to initiate a connection. Based on this information the gatekeeper will accept or refuse the request. A refusal may happen, e.g. if a user's pre-paid account has run out. Or he requests a service which he is not subscribed to, e.g. making an international call when he only has rights for national calls. Bandwidth control: The gatekeeper monitors and controls the IP terminals bandwidth needs and making sure, that video and audio traffic does not exceed the administrative limit. Choosing the appropriate limit can ensure, that a WAN connection does not use up all available bandwidth but leaves a minimum to other applications like or FTP. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 12 of 19

13 4.2.2 Additional functions of the Gatekeeper The gatekeeper supports the following additional functions. User identification and rights: The gatekeeper performs a user identification with Kerberos- Authentication or via a certificate of authenticity. It allows or rejects calls from each user by checking configurable rights. These rights may depend on the zone, the gateway used, the bandwidth available and requested, or the time. Collection of charging information: After closing a call the gatekeeper transfers all the relevant information such as the B-number, A-number, and the calls duration to a system handling Call Detail Recording (CDR). Access to X.500 Directory Services: The gatekeeper grants access to directory services like Microsoft Active Directory or Novell NDS for centralized storage of user data. A directory service includes a hierarchical database with objects called attributes. Some attributes of user objects are name, phone number and address. The contents of the attributes are values. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 13 of 19

14 4.3 Das H.323 Gateway (1/4) A gateway is hardware and software interconnecting different networks with or without protocol conversion. The function of a gateway is to transmit messages from one computer network to another. It is located on the lowest protocol layer common to both networks. In extreme cases, that layer could be the OSI application layer. The gateway can interpret the protocols of either side, thus it can decode the data packages of one side down to the lowest common layer and pack it again with new header information for the other sides protocols. The complete protocol conversion includes address translation, data formatting, buffering of packages and acknowledgement as well as flow control and data rate adaptation. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 14 of 19

15 4.3 Das H.323 Gateway (2/4) H.323 gateways enable connections between voice and data networks. They offer Ethernet interfaces for data network connection and analog or ISDN interfaces for circuit switched networks. The ISDN interface is either a Basic Rate Interface (BRI) with 2 voice circuits or a Primary Rate Interface (PRI) handling 30 circuits following E1 standard. Besides protocol conversion, IP telephony gateways internally work on procedures for call setup and teardown as well as voice packet modification, e.g. from IP codec G.729A (8 kbps) to G.711 (64 kbps). Thus VoIP subscribers are fully available from the public switched telephone network. The responsibilities of the gateway as an endpoint includes the Jitter Buffer, runtime optimization, and echo suppression etc. The translation functions of the gateway are described in H.246. A gateway is not necessary if no connection to a standard telephony network exists. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 15 of 19

16 4.3 Das H.323 Gateway (3/4) The hardware- and software structure of a gateway are similar to that of an IP hardware phone. The hardware differs in the number of DSPs and the gateway does not have a user and voice interface. Instead it has one to the telephony network. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 16 of 19

17 4.3 Das H.323 Gateway (4/4) On the IP network side, the gateway supports call setup and release using H.225 with Q.931 messages. The protocol Q.931 is used for signaling in both ISDN and H.323. In ISDN the D-channel is the transport media. As no equivalent exists in IP, TCP is used instead. With RAS signaling a gateway is registered to the gatekeeper. The H.245 layer above is responsible for call control signaling and for opening a logical channel carrying video and audio data. Signaling enables the exchange of capability information to the H.323 terminal as well as the negotiation of functionalities such as the audio codec used on the IP network side. In the highest layer, voice frames are transcoded into a constant bit rate of 64 kbps. On the ISDN side, a B-channel transports this bit stream. H.225 and H.245 signaling is found on the appropriate layer of the ISDN D-channel. Remarkably, from an H.323 network point of view, the gateway behaves like an H.323 terminal. Correspondingly, the gateway also behaves like a terminal from the telephony network point of view. This means that when a call is made from an H.323 network into a telephony network the H.323 gateway has to convert all necessary signaling. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 17 of 19

18 4.4 The MCU (1/2) A conference is a virtual meeting of three or more distant partners with a real time audio or video communication. All data, i.e. audio, video and text, can be digitized, exchanged and worked on simultaneously. The Multipoint Control Unit MCU supports IP telephony conferences between several terminals. All of them have to establish a connection to the MCU. The MCU checks the voice processing abilities of each terminal, decides which codec to take and distributes the voice information, in a process called media streaming. The MCU is composed of the following elements: The Multipoint Processor (MP) receives audio and video data streams from the conference participants, mixes them into one data stream and then distributes this to the terminals that are part of the multipoint conference. The Multipoint Controller (MC) offers basic functions for multipoint conferences. It is responsible for the negotiation of capabilities and the control of the conference. The MC function can be located in a terminal, a gateway, the gatekeeper or in an MCU. The MCU is an endpoint supporting multipoint conferences and consists of at least one MC and one or more MPs. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 18 of 19

19 4.4 The MCU (2/2) During a centralized multipoint conference all terminals send their multimedia data to the MCU using a point-to-point connection. In addition, the data stream contains different signaling information to be processed by the MC. For the MCU to manage a centralized conference, it has to have at least one MP as well as the MC. The task of this MP is mixing the received data streams into one and distributing it to all terminals within the conference. Using multicast technology terminals in a decentralized conference can exchange data directly. In contrast to a centralized conference, the MCU in a decentralized conference only has to perform different control tasks. In a decentralized conference the multimedia data streams have to be combined in the terminals. The MC may be located in one terminal. When several terminals hold an MC the one of highest value controls the conference. This process is called master and slave designation. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 19 of 19

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

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

Glossary of Terms and Acronyms for Videoconferencing

Glossary of Terms and Acronyms for Videoconferencing Glossary of Terms and Acronyms for Videoconferencing Compiled by Irene L. Ferro, CSA III Education Technology Services Conferencing Services Algorithm an algorithm is a specified, usually mathematical

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

District of Columbia Courts Attachment 1 Video Conference Bridge Infrastructure Equipment Performance Specification

District of Columbia Courts Attachment 1 Video Conference Bridge Infrastructure Equipment Performance Specification 1.1 Multipoint Control Unit (MCU) A. The MCU shall be capable of supporting (20) continuous presence HD Video Ports at 720P/30Hz resolution and (40) continuous presence ports at 480P/30Hz resolution. B.

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

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

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

Traditional Telephony IP Telephony Voice, Data, Video Integration. Media Convergence. IP Router Server IP Router. Video Distribution Fax

Traditional Telephony IP Telephony Voice, Data, Video Integration. Media Convergence. IP Router Server IP Router. Video Distribution Fax Introduction IP telephony allows organizations and individuals to lower the costs of existing services such as data and broadcast video, while broadening their means of communication to include modern

More information

Videoconferencing Glossary

Videoconferencing Glossary Videoconferencing Glossary Algorithm A set of specifications that define methods and procedures for transmitting audio, video, and data. Analog Gateway A means of connecting dissimilar codecs. Incoming

More information

(Refer Slide Time: 4:45)

(Refer Slide Time: 4:45) Digital Voice and Picture Communication Prof. S. Sengupta Department of Electronics and Communication Engineering Indian Institute of Technology, Kharagpur Lecture - 38 ISDN Video Conferencing Today we

More information

An Introduction to Voice over the IP. Test1 Pool Questions

An Introduction to Voice over the IP. Test1 Pool Questions Dr. Mona Cherri Business and Technology North Lake College/DCCCD An Introduction to Voice over the IP I. True and False Questions Test1 Pool Questions 1. The first Internet-telephony software, Internet

More information

CompTIA Convergence+ 2006 Examination Objectives

CompTIA Convergence+ 2006 Examination Objectives CompTIA Convergence+ 2006 Examination Objectives Introduction The CompTIA Convergence+ examination covering the 2006 objectives certifies that the successful candidate has the necessary knowledge to perform

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

Introduction to VoIP Technology

Introduction to VoIP Technology Lesson 1 Abstract Introduction to VoIP Technology 2012. 01. 06. This first lesson of contains the basic knowledge about the terms and processes concerning the Voice over IP technology. The main goal of

More information

Technical Specifications and Trial Directives of Video Conferencing System

Technical Specifications and Trial Directives of Video Conferencing System Technical Specifications and Trial Directives of Video Conferencing System 1 VIDEO Specifications Trial Directive Complied/Not Complied a Signal system The system should support PAL and should be a Refer

More information

Voice over IP (VoIP) Part 2

Voice over IP (VoIP) Part 2 Kommunikationssysteme (KSy) - Block 5 Voice over IP (VoIP) Part 2 Dr. Andreas Steffen 1999-2001 A. Steffen, 10.12.2001, KSy_VoIP_2.ppt 1 H.323 Network Components Terminals, gatekeepers, gateways, multipoint

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

2 Voice over IP Network

2 Voice over IP Network 2 Voice over IP Network VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 8 2.1 VoIP Network Elements...3 2.2 Single-Site VoIP Location...4 2.3 Multi-Site VoIP Location...5 2.4 PBX Networking

More information

1ISDN. August 2000. Software Reference ISDN 1

1ISDN. August 2000. Software Reference ISDN 1 1ISDN August 2000 Software Reference ISDN 1 2 ISDN Software Reference Table of Contents ISDN Table of Contents A REFERENCE 5 1 ISDN Connections on a BinTec router 6 1.1 Some background on ISDN 6 1.1.1

More information

Level: 3 Credit value: 9 GLH: 80. QCF unit reference R/507/8351. This unit has 6 learning outcomes.

Level: 3 Credit value: 9 GLH: 80. QCF unit reference R/507/8351. This unit has 6 learning outcomes. This unit has 6 learning outcomes. 1. Know telephony principles. 1.1. Demonstrate application of traffic engineering concepts Prioritization of voice traffic Trunking requirements Traffic shaping. 1.2.

More information

Voice-Over-IP for Corporate Users

Voice-Over-IP for Corporate Users Edwin van Tricht and Cor Quist Voice-Over-IP for Corporate Users A solution in search of a problem? What is the real value of voice over IP (VoIP) for corporate users? This is the key question of this

More information

Operation Manual Voice Overview (Voice Volume) Table of Contents

Operation Manual Voice Overview (Voice Volume) Table of Contents Operation Manual Voice Over (Voice Volume) Table of Contents Table of Contents Chapter 1 Voice Over... 1-1 1.1 Introduction to VoIP... 1-1 1.1.1 VoIP System... 1-1 1.1.2 Basic VoIP Call Flow... 1-2 1.1.3

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

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

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

Computer Network. Interconnected collection of autonomous computers that are able to exchange information

Computer Network. Interconnected collection of autonomous computers that are able to exchange information Introduction Computer Network. Interconnected collection of autonomous computers that are able to exchange information No master/slave relationship between the computers in the network Data Communications.

More information

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use.

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use. IP Networking Guide Model No. Pure IP-PBX KX-NCP500 KX-NCP1000 Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future

More information

1. Introduction. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 11

1. Introduction. VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 11 1. Introduction VOIP, Version 1.6e T.O.P. BusinessInteractive GmbH Page 1 of 11 1.1 Telephone and Data Networks...3 1.2 The classic Telecommunication System and Connections...4 1.3 The Voice over IP Concept

More information

Chapter 5. Data Communication And Internet Technology

Chapter 5. Data Communication And Internet Technology Chapter 5 Data Communication And Internet Technology Purpose Understand the fundamental networking concepts Agenda Network Concepts Communication Protocol TCP/IP-OSI Architecture Network Types LAN WAN

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

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

Region 10 Videoconference Network (R10VN)

Region 10 Videoconference Network (R10VN) Region 10 Videoconference Network (R10VN) Network Considerations & Guidelines 1 What Causes A Poor Video Call? There are several factors that can affect a videoconference call. The two biggest culprits

More information

Getting Started KX-TDA5480

Getting Started KX-TDA5480 4-Channel VoIP Gateway Card Getting Started KX-TDA5480 Model KX-TDA0484 Thank you for purchasing the Panasonic 4-Channel VoIP Gateway Card, KX-TDA5480/KX-TDA0484. Please read this manual carefully before

More information

IP Telephony v1.0 Scope and Sequence. Cisco Networking Academy Program

IP Telephony v1.0 Scope and Sequence. Cisco Networking Academy Program IP Telephony v1.0 Scope and Sequence Cisco Networking Academy Program Table of Content COURSE OVERVIEW...4 Course Description...4 Course Objectives...4 Target Audience...5 Prerequisites...5 Lab Requirements...5

More information

AUTOMATIC BILLING SYSTEM FOR CISCO ANALOG TELEPHONE ADAPTOR ATA 186/188

AUTOMATIC BILLING SYSTEM FOR CISCO ANALOG TELEPHONE ADAPTOR ATA 186/188 AUTOMATIC BILLING SYSTEM FOR CISCO ANALOG TELEPHONE ADAPTOR ATA 186/188 Rosen Ivanov Technical University of Gabrovo, BULGARIA E-mail: rs-soft@ieee.org Abstract: This paper presents an automatic billing

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

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

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

1. Public Switched Telephone Networks vs. Internet Protocol Networks

1. Public Switched Telephone Networks vs. Internet Protocol Networks Internet Protocol (IP)/Intelligent Network (IN) Integration Tutorial Definition Internet telephony switches enable voice calls between the public switched telephone network (PSTN) and Internet protocol

More information

- Basic Voice over IP -

- Basic Voice over IP - 1 Voice over IP (VoIP) - Basic Voice over IP - Voice over IP (VoIP) is a digital form of transport for voice transmissions, replacing analog phone systems. The benefits of VoIP are considerable: Better

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

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

Introduction. Video conferencing. Equipment. Systems. Multipoint Conferences. Group Meetings

Introduction. Video conferencing. Equipment. Systems. Multipoint Conferences. Group Meetings Video conferencing Introduction Standards Products Internet telephony Computer Telephony Integration (CTI) Introduction Video conferencing can be used for + Audio-visual communication + Sharing of documents,

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

Getting Started. 16-Channel VoIP Gateway Card. Model No. KX-TDA0490

Getting Started. 16-Channel VoIP Gateway Card. Model No. KX-TDA0490 16-Channel VoIP Gateway Card Getting Started Model No. KX-TDA0490 Thank you for purchasing a Panasonic 16-Channel VoIP Gateway Card. Please read this manual carefully before using this product and save

More information

About IHM VoIP. Description of IHM VoIP enabled products and protocols used.

About IHM VoIP. Description of IHM VoIP enabled products and protocols used. H. MORTENSEN P/S Vandtårnsvej 87 286 Søborg Firmatelefon 39 66 31 31 Direkte indvalg 39 57 26 27 Telefax 39 66 14 45 Firma E-mail sales@ihm.dk Personlig E-mail mn@ihm.dk Hjemmeside www.ihm.dk Bank Sparbank

More information

Technical Specifications of Video Conferencing System

Technical Specifications of Video Conferencing System Technical Specifications of Video Conferencing System 1 VIDEO Amended specifications proposed by BOO a Signal system The system should support PAL and should be a point-to-point system with codec, Full

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

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

WEB CONFIGURATION. Configuring and monitoring your VIP-101T from web browser. PLANET VIP-101T Web Configuration Guide

WEB CONFIGURATION. Configuring and monitoring your VIP-101T from web browser. PLANET VIP-101T Web Configuration Guide WEB CONFIGURATION Configuring and monitoring your VIP-101T from web browser The VIP-101T integrates a web-based graphical user interface that can cover most configurations and machine status monitoring.

More information

IMPLEMENTING CISCO VOICE COMMUNICATIONS AND QOS Volume 1

IMPLEMENTING CISCO VOICE COMMUNICATIONS AND QOS Volume 1 IMPLEMENTING CISCO VOICE COMMUNICATIONS AND QOS Volume 1 Course Introduction Overview Learner Skills and Knowledge Course Goal and Course Flow Additional References Cisco Glossary of Terms Your Training

More information

VoIP for Radio Networks

VoIP for Radio Networks White Paper VoIP for Radio Networks Revision 1.0 www.omnitronicsworld.com In the early eighties, a communications protocol was created that allowed the research community to send data anywhere in the world

More information

IPNext 50 NGN IP-PBX High-performance Next Generation IP-PBX Solution

IPNext 50 NGN IP-PBX High-performance Next Generation IP-PBX Solution IPNext 50 NGN IP-PBX High-performance Next Generation IP-PBX Solution IP-PBX Features www.addpac.com AddPac Technology 2008, Sales and Marketing Contents IP-PBX Features Smart Multimedia Manager VoIP Gateway

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

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use.

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use. Panasonic Telephone Systems KX-TDE100 KX-TDE200 KX-TDE600 www.voicesonic.com Phone: 877-289-2829 IP Networking Guide Pure IP-PBX Panasonic KX-TDE100, KXTDE100, TDE100, KX-TDE200, KXTDE200, TDE200, KX-TDE600,

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

Gateways and Their Roles

Gateways and Their Roles Gateways and Their Roles Understanding Gateways This topic describes the role of voice gateways and their application when connecting VoIP to traditional PSTN and telephony equipment. Analog vs. Digital

More information

Getting Started. 16-Channel VoIP Gateway Card. Model No. KX-TDA0490

Getting Started. 16-Channel VoIP Gateway Card. Model No. KX-TDA0490 16-Channel VoIP Gateway Card Getting Started Model No. KX-TDA0490 Thank you for purchasing a Panasonic 16-Channel VoIP Gateway Card. Please read this manual carefully before using this product and save

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

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

Configuration Notes 283

Configuration Notes 283 Mediatrix 4400 Digital Gateway VoIP Trunking with a Legacy PBX June 21, 2011 Proprietary 2011 Media5 Corporation Table of Contents Table of Contents... 2 Introduction... 3 Mediatrix 4400 Digital Gateway

More information

Implementation of Voice over IP and Audio over IP in the Studio environment

Implementation of Voice over IP and Audio over IP in the Studio environment Mediatech 2015 Implementation of Voice over IP and Audio over IP in the Studio environment Wilfried Hecht, Managing Director AVT Audio Video Technologies GmbH Nordostpark 12 90411 Nuernberg Germany Email:

More information

DL TC72 Communication Protocols: HDLC, SDLC, X.25, Frame Relay, ATM

DL TC72 Communication Protocols: HDLC, SDLC, X.25, Frame Relay, ATM DL TC72 Communication Protocols: HDLC, SDLC, X.25, Frame Relay, ATM Objectives: Base training of an engineer for the installation and maintenance of Digital Telecommunications and Internetworking systems.

More information

Voice over IP. Demonstration 1: VoIP Protocols. Network Environment

Voice over IP. Demonstration 1: VoIP Protocols. Network Environment Voice over IP Demonstration 1: VoIP Protocols Network Environment We use two Windows workstations from the production network, both with OpenPhone application (figure 1). The OpenH.323 project has developed

More information

Introducing Cisco Unified Communications Express

Introducing Cisco Unified Communications Express CHAPTER 1 Introducing Cisco Unified Communications Express Cisco Unified Communications Express is an award-winning communications solution that is provided with the Cisco Integrated Services Router portfolio.

More information

VoIP Glossary. Client (Softphone client): The software installed in the userâ s computer to make calls over the Internet.

VoIP Glossary. Client (Softphone client): The software installed in the userâ s computer to make calls over the Internet. VoIP Glossary Analog audio signals: Analog audio signals are used to transmit voice data over telephone lines. This is done by varying or modulating the frequency of sound waves to accurately reflect the

More information

Mediatrix 4404 Step by Step Configuration Guide June 22, 2011

Mediatrix 4404 Step by Step Configuration Guide June 22, 2011 Mediatrix 4404 Step by Step Configuration Guide June 22, 2011 Proprietary 2011 Media5 Corporation Table of Contents First Steps... 3 Identifying your MAC Address... 3 Identifying your Dynamic IP Address...

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

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

AP200 VoIP Gateway Series Design Features & Concept. 2002. 3.5 AddPac R&D Center

AP200 VoIP Gateway Series Design Features & Concept. 2002. 3.5 AddPac R&D Center AP200 VoIP Gateway Series Design Features & Concept 2002. 3.5 AddPac R&D Center Contents Design Features Design Specifications AP200 Series QoS Features AP200 Series PSTN Backup Features AP200 Series Easy

More information

Total Recall Max SIP VoIP Call Recording Server

Total Recall Max SIP VoIP Call Recording Server Total Recall Max SIP VoIP Call Recording Server Introduction In an increasingly security conscious, results driven and litigious world, communications recording is vital to meeting your duty of care, management

More information

Network Connection Considerations for Microsoft Response Point 1.0 Service Pack 2

Network Connection Considerations for Microsoft Response Point 1.0 Service Pack 2 Network Connection Considerations for Microsoft Response Point 1.0 Service Pack 2 Updated: February 2009 Microsoft Response Point is a small-business phone solution that is designed to be easy to use and

More information

AMERHIS GATEWAY FAMILY

AMERHIS GATEWAY FAMILY SPACE AMERHIS GATEWAY FAMILY Satellite communications, earth observation, navigation and positioning and control stations indracompany.com AMERHIS AMERHIS GATEWAY FAMILY The first multibeam satellite switching

More information

Challenges and Solutions in VoIP

Challenges and Solutions in VoIP Challenges and Solutions in VoIP Challenges in VoIP The traditional telephony network strives to provide 99.99 percent uptime to the user. This corresponds to 5.25 minutes per year of down time. Many data

More information

802.1p An IEEE standard for providing QoS using three bits (defined in 802.1q) to allow switches to reorder packets based on priority level.

802.1p An IEEE standard for providing QoS using three bits (defined in 802.1q) to allow switches to reorder packets based on priority level. Glossary and Terms 802.1p An IEEE standard for providing QoS using three bits (defined in 802.1q) to allow switches to reorder packets based on priority level. 802.1q An IEEE standard for providing virtual

More information

Function Description Ascom IP-DECT System

Function Description Ascom IP-DECT System Function Description Contents 1 Introduction... 1 1.1 Abbreviations and Glossary... 1 2 Technical Solution... 2 2.1 System Size... 2 2.2 LDAP Server... 3 2.3 Supported Protocols... 3 2.4 Power the Base

More information

Enterprise Edge Communications Manager. Data Capabilities

Enterprise Edge Communications Manager. Data Capabilities Enterprise Edge Communications Manager Data Capabilities Data Module Objectives After the completion of this module you will be able to describe the following Data components of the Enterprise Edge Communications

More information

Panasonic KX-NCP500 KXNCP500 KX NCP500 KX-NCP1000 KXNCP1000 KX NCP1000

Panasonic KX-NCP500 KXNCP500 KX NCP500 KX-NCP1000 KXNCP1000 KX NCP1000 Model No. KX-NCP500 KX-NCP1000 www.voicesonic.com Phone 877-289-2829 IP Networking Guide Pure IP-PBX Panasonic KX-NCP500 KXNCP500 KX NCP500 KX-NCP1000 KXNCP1000 KX NCP1000 Thank you for purchasing a Panasonic

More information

WAN Technology. Heng Sovannarith heng_sovannarith@yahoo.com

WAN Technology. Heng Sovannarith heng_sovannarith@yahoo.com WAN Technology Heng Sovannarith heng_sovannarith@yahoo.com Introduction A WAN is a data communications network that covers a relatively broad geographic area and often uses transmission facilities provided

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

Chapter 9A. Network Definition. The Uses of a Network. Network Basics

Chapter 9A. Network Definition. The Uses of a Network. Network Basics Chapter 9A Network Basics 1 Network Definition Set of technologies that connects computers Allows communication and collaboration between users 2 The Uses of a Network Simultaneous access to data Data

More information

BLACK BOX. The Changing Communications Market. PBX Systems for Voice over IP (VoIP)

BLACK BOX. The Changing Communications Market. PBX Systems for Voice over IP (VoIP) The Changing Communications Market BLACK BOX Learn how this new technology is in reach for small and medium businesses (SMBs). Hybrid PBX VoIP Gateways Box IP Phones Headsets 724-746-5500 blackbox.com

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

Video over IP WHITE PAPER. Executive Summary

Video over IP WHITE PAPER. Executive Summary Video over IP Executive Summary Thinking as an executive, there are pressures to keep costs down and help a company survive in this challenging market. Let us assume that company A has 10 locations and

More information

GLOSSARY. 3G network:

GLOSSARY. 3G network: GLOSSARY 3G network: ADSL: APP: Bit: Bitrate: Broadband: Byte: CallBack: Channel: DTMF: Ethernet: Gateway: (also UMTS network) "Universal Mobile Telecommunications System", UMTS represents an evolution

More information

ZyXEL V100 Support Notes. ZyXEL V100. (V100 Softphone 1 Runtime License) Support Notes

ZyXEL V100 Support Notes. ZyXEL V100. (V100 Softphone 1 Runtime License) Support Notes ZyXEL V100 (V100 Softphone 1 Runtime License) Support Notes Version 1.00 April 2009 1 Contents Overview 1. Overview of V100 Softphone...3 2. Setting up the V100 Softphone.....4 3. V100 Basic Phone Usage.....7

More information

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use.

Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product and save this manual for future use. IP Networking Guide Pure IP-PBX Model No. KX-NCP500/KX-NCP1000 KX-TDE100/KX-TDE200/KX-TDE600 Thank you for purchasing a Panasonic Pure IP-PBX. Please read this manual carefully before using this product

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

Troubleshooting Tools to Diagnose or Report a Problem February 23, 2012

Troubleshooting Tools to Diagnose or Report a Problem February 23, 2012 Troubleshooting Tools to Diagnose or Report a Problem February 23, 2012 Proprietary 2012 Media5 Corporation Scope of this Document This Technical Bulletin aims to inform the reader on the troubleshooting

More information

Chapter 2 - The TCP/IP and OSI Networking Models

Chapter 2 - The TCP/IP and OSI Networking Models Chapter 2 - The TCP/IP and OSI Networking Models TCP/IP : Transmission Control Protocol/Internet Protocol OSI : Open System Interconnection RFC Request for Comments TCP/IP Architecture Layers Application

More information

Internet Telephony Terminology

Internet Telephony Terminology Internet Telephony Terminology Understanding the business phone system world can be a daunting task to a lay person who just wants a system that serves his or her business needs. The purpose of this paper

More information

1 ABSTRACT 3 2 CORAL IP INFRASTRUCTURE 4

1 ABSTRACT 3 2 CORAL IP INFRASTRUCTURE 4 Coral IP Solutions TABLE OF CONTENTS 1 ABSTRACT 3 2 CORAL IP INFRASTRUCTURE 4 2.1 UGW 4 2.2 IPG 4 2.3 FLEXSET IP 5 2.4 FLEXIP SOFTPHONE 6 2.5 TELEPORT FXS/FXO GATEWAYS 7 2.6 CORAL SENTINEL 7 3 CORAL IP

More information

Integration of Voice over Internet Protocol Experiment in Computer Engineering Technology Curriculum

Integration of Voice over Internet Protocol Experiment in Computer Engineering Technology Curriculum Integration of Voice over Internet Protocol Experiment in Computer Engineering Technology Curriculum V. Rajaravivarma and Farid Farahmand Computer Electronics and Graphics Technology School of Technology,

More information

Curso de Telefonía IP para el MTC. Sesión 1 Introducción. Mg. Antonio Ocampo Zúñiga

Curso de Telefonía IP para el MTC. Sesión 1 Introducción. Mg. Antonio Ocampo Zúñiga Curso de Telefonía IP para el MTC Sesión 1 Introducción Mg. Antonio Ocampo Zúñiga Conceptos Generales VoIP Essentials Family of technologies Carries voice calls over an IP network VoIP services convert

More information

Communications and Computer Networks

Communications and Computer Networks SFWR 4C03: Computer Networks and Computer Security January 5-8 2004 Lecturer: Kartik Krishnan Lectures 1-3 Communications and Computer Networks The fundamental purpose of a communication system is the

More information

Video Conferencing Glossary of Terms

Video Conferencing Glossary of Terms Video Conferencing Glossary of Terms A Algorithm A step-by-step problem-solving procedure. Transmission of compressed video over a communications network requires sophisticated compression algorithms.

More information

IHM VoIP Products. Document history:

IHM VoIP Products. Document history: IHM P/S Vandtaarnsvej 87 DK-2860 Soeborg Denmark IHM VoIP Products Document history: Version: Description: 1.00 24-04-2015 EH First Version 1.01 29-04-2015 SBS Images included and minor text changes made.

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

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