voip gateway


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VOIP allows cheap phone call , call conferencing , voice mail over the internet

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voip gateway

  1. 1. VOIP Gateways<br />NayomiRanamuka<br />
  2. 2. Overview<br /><ul><li>Introduction
  3. 3. Network gateway
  4. 4. What is a VOIP Gateway ?
  5. 5. VOIP Gateway protocols and codecs
  6. 6. How does a VOIP Gateway work?
  7. 7. Convergence with VOIP Gateway
  8. 8. Types of VOIP Gateway
  9. 9. Media Gateway Controller
  10. 10. Signaling Gateway
  11. 11. Factors to purchase a gateway
  12. 12. Standard VoIP gateway Configurations
  13. 13. Examples of VOIP gateways
  14. 14. Summary</li></ul>VOIP Gateway 3<br />
  15. 15. Introduction<br /><ul><li>VOIP allows </li></ul> cheap phone call , call conferencing , voice mail over the internet<br /><ul><li>Some VoIP service providers offer </li></ul> live broadcasts of radio shows and sports events<br /><ul><li>Components of a VoIP network </li></ul> User agents<br /> Gateways<br /> Proxy servers<br /><ul><li>Selecting the right gateway is a crucial
  16. 16. Understanding the role VoIP gateway is very important</li></ul>VOIP Gateway 3<br />
  17. 17. Voice traffic over IP networks <br />PC to PC <br /><ul><li> Need a pc with sound card
  18. 18. IP telephony software</li></ul>PC to phone<br /><ul><li>Need a gateway that connects IP network to phone network</li></ul> ( Router to PBX )<br />VOIP Gateway 4<br />
  19. 19. (3) Phone to Phone<br /><ul><li>Need more gateways that connect IP network to phone network
  20. 20. Ip network could be Internet or dedicated intranet</li></ul>VOIP Gateway 5<br />
  21. 21. Network gateway<br /><ul><li>It is a network point that acts as an entrance to another network
  22. 22. A gateway links two systems that do not use the same:
  23. 23. Communication protocols         ,       Languages                                 
  24. 24. Data formatting structures , Architecture
  25. 25. It can be implemented in software, hardware, or as a combination of both</li></ul> Ex:- Electronic mail gateways(X.400 gateway)<br /> receive messages in one format, and then translate it<br /> and forward in X.400 format used by the receiver, and vice versa.<br /> VOIP Gateway 6<br />
  26. 26. What is a VoIP gateway?<br /><ul><li>Act as conversion interface between PSTN and an IP network
  27. 27. This device converts voice and fax calls, in real time, between the public switched telephone network (PSTN) and an IPnetwork
  28. 28. The primary functions of a VoIP gateway include
  29. 29. voice and fax compression/decompression
  30. 30. packetization
  31. 31. call routing
  32. 32. control signaling</li></ul> VOIP Gateway 7<br />
  33. 33. What is a VoIP gateway?<br /><ul><li>Media gateways, also commonly referred to as VoIP gateways
  34. 34. Users on a VoIP network can't make or receive calls </li></ul> to and from "outsiders" with traditional phone lines without gateway.<br /><ul><li>There are </li></ul>VoIP-to-GSM(Mobile communication ) gateways<br />and VoIP-to-CDMA(Code-Division Multiple Access ) gateways <br /> that route VoIP calls directly for GSM or CDMA<br /> VOIP Gateway 8<br />
  35. 35. VoIP gateway protocols and codecs<br /><ul><li>Codec ( coder – decoder ) :-</li></ul> Software or hardware that converts analog signals to digital form and signals from digital to analog form<br /><ul><li>It also determines </li></ul>sound quality and bandwidth required to send the packet<br /><ul><li> If a user doesn’t able to hear anything, the application in user side </li></ul> does not support codec with which data had been coded<br /> VOIP Gateway 9<br />
  36. 36. Codec ( coder – decoder )<br /><ul><li>In voice gateways a concept of "codec" supposes </li></ul> not only coding/decoding algorithms but their hardware realization<br /><ul><li>The most common voice codecs are:
  37. 37. GSM – 13 Kbps
  38. 38. iLBC – 15 Kbps
  39. 39. G .711– 64 Kbps
  40. 40. G. 722 – 4 8 / 56 / 64 Kbps
  41. 41. G. 726 - 16 / 24 / 32 / 40 Kbps
  42. 42. G. 728 - 16 Kbps
  43. 43. G. 729 - 8 Kbps</li></ul> VOIP Gateway 10<br />
  44. 44. VoIP protocols<br /><ul><li>A VoIP protocol determines</li></ul> how your voice packet is transported across a network<br /><ul><li>A VoIP gateway will typically support a single protocol
  45. 45. Most common VoIP protocols
  46. 46. SIP (Session Initiation Protocol) </li></ul> Used and supported<br /> by the vast majority of VoIP phone systems and services<br /><ul><li>SCCP (Cisco Skinny Client Control Protocol) –</li></ul> Used by Cisco’s Call Manager and IP phones. <br /><ul><li>MGCP – an older VoIP protocol
  47. 47. H.323 – an older VoIP protocol </li></ul> But is no longer widely used and or supported both MGCP & H.323<br /> VOIP Gateway 11<br />
  48. 48. <ul><li>Make sure your VoIP gateway supports </li></ul> the same protocols and codecs<br /> that your VoIP service and or VoIP phone system support<br /><ul><li>If you’re the responsible person, </li></ul> for the set-up, installation and maintenance of a VoIP gateway you will want to further your knowledge in the area of protocols and codecs. <br /> VOIP Gateway 12<br />
  49. 49. How does a VoIP gateway work?<br /><ul><li>If the voice traffic is originating from the PSTN
  50. 50. VoIP gateway convert analog voice signal into a digital signal
  51. 51. This digital signal is then compressed using a codec
  52. 52. Then broken into a series of packets</li></ul> to transfer across the IP network using a signaling protocol <br />PSTN<br />IP Voice<br />VOIPGateway<br />Protocol conversion<br />Voice compression<br />Packetization<br />IP Network<br />PBX:- a private telephone network used within an enterprise<br />PBX<br /> VOIP Gateway 13 <br />
  53. 53. How does a VoIP gateway work?<br /><ul><li>If the voice traffic is originating from an IP network
  54. 54. VoIP gateway decompress the digital packets into a digital signal
  55. 55. Then converted into an analog signal </li></ul> to be sent across the PSTN<br />PSTN<br />IP Voice<br />IP Network<br />VOIPGateway<br />Protocol conversion<br />Voice decompression<br />PBX<br /> VOIP Gateway 14<br />
  56. 56. Convergence with VOIP Gateway<br /><ul><li>VOIP Gateway receive outbound phone calls and determines </li></ul> that the outgoing calls to the internet or to the PSTN depending call type<br /><ul><li>VOIP Gateway receive inbound phone calls and determines </li></ul> that the incoming calls to the PABX, IP Phone or to another VOIP Gateway<br /> VOIP Gateway 15<br />
  57. 57. Types of VoIP Gateways<br /><ul><li>There are two main types of gateways
  58. 58. Analog gateway
  59. 59. Digital gateway
  60. 60. Analog Gateway
  61. 61. Used to connect </li></ul> PSTN to a VoIP phone system or VoIP phone system to the PSTN<br /><ul><li>Due to this dual purpose</li></ul> an analog VoIP gateway comes in two different forms fxs - fxo<br /> VOIP Gateway 16<br />
  62. 62. Analog Gateway<br /><ul><li>FXS gateway – </li></ul> A FXS gateway is used to connect <br />your PSTN to a VoIP phonesystem.<br /><ul><li>FXO gateway – </li></ul> An FXO gateway is used to connect <br /> your VoIP phone system to your PSTN lines.<br /> VOIP Gateway 17<br />
  63. 63. Digital Gateway<br /><ul><li>Used to connect traditional PBX system to an IP network
  64. 64. Analog and digital gateways both do the same thing
  65. 65. The difference between an analog and a digital VoIP gateway </li></ul>are the interfaces uses to connect to various solution components <br />PSTN<br />PSTN<br />VoIP Gateway<br />IP Voice<br />IP Network<br />Ethernet<br />PPP<br />Frame Relay<br />ATM<br />PBX<br />PBX<br /> VOIP Gateway 18<br />
  66. 66. Media Gateway Controller (MGC)<br /><ul><li>Receives signaling information (like dialed digits) from the Media Gateway and can inform it to alert the called party, to send and receive voice data
  67. 67. Protocols between MGC and Media Gateway:</li></ul> SGCP, IPDC, SS7, H.323,SIP,MGCP and Megaco(also known as H.248)<br /><ul><li>A media gateway controller is sometimes called as</li></ul>call agent, call controller, or softswitch<br /> VOIP Gateway 19<br />
  68. 68. Signaling Gateway<br /><ul><li>A network device that converts control signals from one format to another</li></ul>SS7:- (Signaling System 7) The protocol used in PSTN<br />SIGnalingTRANsport :-<br /> An IP telephony protocol that is used <br /> to transfer SS7 signals over IP networks<br />Ex:- SIGTRAN signaling gateway converts<br /> SS7 signals of the PSTN to SIGTRAN for transport over IP<br /> VOIP Gateway 20<br />
  69. 69. Coverged network<br /> VOIP Gateway 21<br />
  70. 70. Factors to purchase a gateway<br /><ul><li>Call load
  71. 71. Make sure the gateway you select can handle</li></ul> the volume of VoIP calls that will need to go through it<br /><ul><li>VoIP protocol support
  72. 72. Gateway must support the protocol used by your network's VoIP system
  73. 73. Compatibility
  74. 74. Should have compatible ports with those on your private branch exchange (PBX) equipment.
  75. 75. Cost
  76. 76. Price depend on type, brand, features, and capacity.
  77. 77. You want the best VoIP gateway solution that fits your budget and meets your needs.</li></ul> VOIP Gateway 22<br />
  78. 78. Standard VoIP gateway Configurations<br /><ul><li>FXS / FXO Gateway :-
  79. 79. 4 port
  80. 80. 8 port
  81. 81. 16 port
  82. 82. 24 port
  83. 83. 48 port
  84. 84. Digital gateways :-
  85. 85. 1T1, 2T1, 4T1
  86. 86. 1E1, 2E1, 4E1
  87. 87. 1BRI, 2BRI, 4BRI </li></ul> VOIP Gateway 23<br />
  88. 88. Examples of VoIP gateways<br /><ul><li>Motorola
  89. 89. Provides traditional, advanced, and wireless VoIP gateways designed to work with broadband Internet connections.
  90. 90. Mediatrix
  91. 91. Can connect to traditional PBX systems as well as IP PBX, with both analog and digital gateways</li></ul> VOIP Gateway 24<br />
  92. 92. Examples of VoIP gateways<br /><ul><li>NovaTec
  93. 93. Provide VoIP-to-GSM gateways
  94. 94. Hypermedia
  95. 95. Offers the CDMA Gateway Series </li></ul> for connecting IP PBX devices with CMDA cellular networks.<br /> VOIP Gateway 25<br />
  96. 96. <ul><li>Cisco AS5300/Voice Gateway
  97. 97. The Cisco AS5300 is an dialup remote access server and voice-over-IP (VoIP) gateway.
  98. 98. When equipped with voice feature cards (VFCs) and voice-enabled Cisco IOS® software, </li></ul> the AS5300 supports carrier-class VoIP and fax over IP services<br /> VOIP Gateway 26<br />
  99. 99. Summary<br /><ul><li>Understanding the role VoIP gateway is very important
  100. 100. Network gateway is a network point that acts as an entrance to another network
  101. 101. VOIP Gateway act as conversion interface between PSTN and an IP network
  102. 102. You should have a knowledge in the area of protocols and codecs
  103. 103. Two main types of gateways are analog gateway & digital gateway
  104. 104. A media gateway controller is called as call agent, call controller, or softswitch.
  105. 105. Signaling gateway converts control signals from one format to another
  106. 106. Factors to purchase a gateway are call load, voip protocol support, compatibility & cost</li></ul> VOIP Gateway 27<br />
  107. 107. References<br /><ul><li>www.wikipedia.org
  108. 108. www.voipsupply.com
  109. 109. www.voip-info.org
  110. 110. www.roseindia.net
  111. 111. www.3cx.com</li></ul> VOIP Gateway 28<br />
  112. 112. Any Questions ?<br /> VOIP Gateway 29<br />
  113. 113. Thank You…..<br /> VOIP Gateway 30<br />