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Voice over Internet Protocol

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... is the transport of voice over IP based data networks like WAN, MAN and LAN. ... access numbers. i- Requirements. One of the VoIP service is Computer-to ... – PowerPoint PPT presentation

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Title: Voice over Internet Protocol


1
Voice over Internet Protocol
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Presentation on
COE 341 Term paper presentation, T061
  • Presented By
  • Zuhair Khayyat
  • Ahmad Al-Sharedah
  • Mohammed Almohsen

2
VoIP
  • What is VoIP ?
  • Why VoIP ?
  • How it works ?

3
VoIPs Outlines
4
What is VoIP ?
  • Simply the Future replacement of PSTN (public
    switched telephone network) .
  • Voice over Internet Protocol is the transport of
    voice over IP based data networks like WAN, MAN
    and LAN.
  • First implementation of transmitting voice over
    the network was in 1973 through Network Voice
    Protocol (NVP) invented for (ARPANET).
  • Many vendors and technology organizations are
    involved in VoIP Technology such as Cisco,
    VocalTec, 3Com, Microsoft, USRobotics and
    NetSpeak.

5
Immediate Applications
  • VoIP nowadays is used in many companies to as a
    central phone system for internal communication.
  • Example of VoIP Ministry of Water and
    electricity, which is located in Riyadh,
    supplied by CISCO.

6
Advantages of VoIP over PSTN
  • Low Cost
  • More data rate, PSTN VS. VoIP
  • Mobility
  • Multimedia connection
  • Free services including caller ID, call waiting,
    call transfer ,three-way calling.

7
Types Of VoIP
  • VoIP to VoIP
  • computer-to-computer
  • IP phones
  • ATA (Analog Tel. Adaptor)
  • VoIP to PSTN
  • DID (Direct Inward Dialing)
  • access numbers

8
How it works
i- Requirements
  • One of the VoIP service is Computer-to-Computer
    connection
  • Software http//www.skype.com
  • Microphone
  • Speakers
  • Sound Card
  • Internet connection

ii- Components
  • Call Processing Server
  • User Devices
  • Media/VoIP Gateways
  • IP Network.

9
Components
1- Call Processing Server
  • It is also known as IP/PBX controls VoIP
    connections.
  • Allows various configurations to be deployed
    from a single server to
  • a server farm.
  • Deployments are based on very standard hardware
    that is running
  • specialist software applications.
  • Available either on router platforms or as an
    appliance.

2- User Devices
  • This component may be outer or discrete devices
  • e.g. hard phones, soft phone.

10
Components
3- Media/VoIP Gateways (Gatekeepers )
  • They were used for call admission and control
    and also for bandwidth
  • management.
  • Create VoIP packets from analogue voice signal
    using CODECs

4- IP Network
  • The IP network connects the, often distributed,
    elements of a
  • VoIP network.
  • As VoIP traffic is sensitive to delay, Quality
    of Service must be
  • maintained.

11
Quality and Delay
1- Call Quality
  • Call quality depends on two main things
  • 1- One is the provider you use for VoIP
    service.
  • 2- The quality (and bandwidth) of your Internet
    connection.

2- Service Quality
  • Data networks are designed to transport data
    efficiently but they could face jitter, delay,
    packet loss, data errors, bandwidth problems and
    dropped connections.

12
Quality and Delay
3- Delay
  • Because voice is analogue and has a continuous
    nature, digitizing can
  • introduce a number of quality problems.
  • Delay can be caused by a number of technical
    issues includes
  • 1- Call distance and routing.
  • 2- Bandwidth reliability
  • 3- Data errors.

13
Security Issues
1- Denial of Service
2- Theft of Service
3- Invasion of Privacy
14
Drawbacks and Implementation Challenges
15
  • VoIP still has a few shortcomings that have led
    to believe that it is not ready for widespread
    deployment ,and Because UDP does not provide a
    mechanism to ensure that data packets are
    delivered in sequential order
  • VoIP implementations face problems .
    dealing with latency, that when satellite . . .
    circuits are involved.(400 milliseconds to . .
    600 milliseconds).

16
Drawbacks
  • Faxes Is the difficulty in sending faxes due to
    software and networking restraints in most home
    systems.
  • Internet connection The quality and overall
    reliability of the phone connection is entirely
    reliant upon the quality, reliability, and speed
    of the internet connection .

17
Drawbacks
  • Emergency calls
  • 1- Emergency calls, cannot easily be routed
    to a nearby call center, and are impossible on
    some VoIP systems
  • 2- In the event that the caller is unable to
    give an address, emergency services may be unable
    to locate them in any other way

18
Future of VoIP
  • VoIP 2.0 is the latest version of VoIP which
    will allow the users to advantage of more
    flexibility, customization and powerful features.
  • Mobile VoIP.
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