ip telephony voice over ip voip
Download
Skip this Video
Download Presentation
IP TELEPHONY Voice over IP (VoIP)

Loading in 2 Seconds...

play fullscreen
1 / 16

IP TELEPHONY Voice over IP (VoIP) - PowerPoint PPT Presentation


  • 255 Views
  • Uploaded on

IP TELEPHONY Voice over IP (VoIP). What is IP Telephony?. Compression to less than 32Kbps. Transfers through Routers, LAN Switches etc, using their Protocols. VoIP Placement. Telephone Replacement IPHONE, Ethernet Phone Transmission Substitution Tie Line, Trunk, Loop

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' IP TELEPHONY Voice over IP (VoIP)' - ryanadan


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
what is ip telephony
What is IP Telephony?

Compression to less than 32Kbps

Transfers through Routers,

LAN Switches etc, using their Protocols

voip placement
VoIP Placement
  • Telephone Replacement
      • IPHONE, Ethernet Phone
  • Transmission Substitution
      • Tie Line, Trunk, Loop
  • Switching Alternatives
      • PBX, CO, CENTREX
convergence
“Convergence”
  • Adding Voice, Video, Fax to Data Network
  • Unified Messaging
  • Centralized Communication Services
      • Email, Telephony, Multi-media
  • Common Protocol (IP)
voice to from ip
Voice To/From IP

Voice

Analog

CODEC: Analog to Digital

Compress

Create Voice Datagram

Add Header

(RTP, UDP, IP, etc)

Digital

voice to from ip6
Voice To/From IP

Digital

Process Header

Re-sequence and

Buffer Delay

Decompress

CODEC: Digital to Analog

Analog

Voice

traditional network characteristics
Dedicated Point-to-point

Short/Constant Delay

No Retransmission

Low Error Tolerance

Direct Pass Through

Mainly connectionless

Variable Delay

Packet Loss

Retransmission

Uses protocols

Traditional Network Characteristics

Voice

Data

packet network technologies
Packet Network Technologies

Same Components

Different Performance

An Intranet

  • Routing (TCP/IP)
  • Frame Relay
  • ATM
  • MPLS
  • Routing (TCP/IP)
  • Frame Relay
  • ATM
  • MPLS
voice over ip networks
Voice Over IP Networks

VPN

An Intranet

  • Subscribed
  • Environment
  • No Control except SLA
  • No Guarantees
  • Controlled
  • Environment
  • Performance Objectives
  • Designed to perform

VPN: Virtual Private Networks

voice over ip requirements
Compression

Reduced bps vs. Quality

Silence Suppression

Assumptions

Signaling

Functions

Speed

Echo Control

Local

Quality of Service (QoS)

Toll quality

Voice Enhancements

Directory services

Feature: CLID, Call waiting

Voice Over IP Requirements
ip pbx lan pbx
IP PBX (LAN PBX)

LAN PHONES

GATEKEEPER: VIRTUAL PBX (SERVER BASED PBX)

GATEWAY: EXTERNAL ACCESS CONNECTOR

MCU: MULTIPOINT CONTROL UNIT (Conf. Call, 3 or more units)

technical issues
Technical Issues
  • 64 Kbps or Compressed Voice
      • Standard or Proprietary
  • Network Size
  • Cable Distance (100m)
  • Operation Through LAN Switches
  • VoLAN or VoIP over LAN/WAN
  • Desktop Requirements
  • Global VoIP Standards
slide13

Voice Over IP Building Blocks

Voice

IP

Protocol

Network

Regulatory

Protocol

Standards

Performance

Stanndards

Standard

Jitter

Speech

Coding

IP

Delay

Access

UDP

Fees

Call Control

congestion

TCP

Separation

SIP

Network

Payments

RTP

packetiza-

tion

Interface

RTCP

slide14

H.323 Protocol Stack*

Call Control

Audio

Video

A/V Control

Data

G.7xx

H.26x

H.225

SIP

H.245

T.120

RTCP

RAS

Q.931

RTP

TCP

UDP

IP

*SIP – Session Initiation Protocol is an alternative to H.323

ad