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

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

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     voip gateway voip gateway Presentation Transcript

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