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Telephony: Voice Over IP
Overview

Voice over IP (VoIP) is a technology that enables voice traffic to be carried on data packet switched networks. In the past, there have been two types of networks used to move voice, video, and data communication. The first type of network was the Public Switched Telephone Network (PSTN). This was the system used by the local telephone company. This network was designed to carry only voice traffic. The second type of network was the data communications network found in many private company networks. This network carries data traffic. VoIP combines the two networks into one multiprotocol infrastructure. VoIP technology allows for central administration and management of both voice and data traffic. This provides a cost savings since only one organization is needed to meet both data and voice communication requirements.

Prerequisites

VoIP is an advanced topic. We recommend that you have experience configuring Cisco routers, or have completed the following courses:
  • Building Scalable Cisco Internetworks (BSCI)
  • Building Cisco Multi-layer Switched Networks (BCMSN)
Hardware/Software Requirements

    The hands-on labs (Apply Your Knowledge Exercises) in this book can be covered in 2 different ways.

  • Two VoIP-capable routers (we used two Cisco 2600 series routers).
  • Two WAN Interface Cards (WICs) (we used two WIC 2T cards with high density connectors)
  • Two Voice Network Modules (VNMs)
  • Two FXS Voice Interface Cards (VICs) (we used the 2FXS VICs)
  • Back-to-back V.35 serial cable
  • The IOS on the routers must contain a “PLUS” feature set to support voice.
Delivery Method

Instructor-led, group-paced, classroom-delivery learning model with structured, hands-on activities

Performance-Based Objectives
  • Describe VoIP equipment and general telephony definition
  • Understand analog telephony, how the phone company operates and interacts with business, and how telephones work
  • Comprehend digital telephony and the conversion of analog to digital signals
  • Define the various Cisco products that offer VoIP features
  • Configure 2600 and 3600 series routers for VoIP
  • Design and implement VoIP into your network
Course duration

4 Days

Course outline

Lesson 1: Introduction to Voice over IP
Topic 1A: Sources of Information
Topic 1B: Cisco Voice Hardware
Topic 1C: Design

Lesson 2: Introduction to Analog Telephony
Topic 2A: Telephone Components
Topic 2B: Signaling
Topic 2C: Local Loop
Topic 2D: Voice Switches
Topic 2E: Trunk Types
Topic 2F: Trunk Line Seizure Signaling Types
Topic 2G: Echo and Echo Suppression
Topic 2H: Telephone Call Procedure

Lesson 3: Digital Voice Technology
Topic 3A: Digitizing Analog Signals
Topic 3B: Nyquist Theorem and Sampling
Topic 3C: Quantization
Topic 3D: Speech Coding Schemes
Topic 3E: Voice Compression
Topic 3F: Voice Packetization
Topic 3G: Telephone Voice Quality
Topic 3H: Channel Signal Types and Frame Formats
Topic 3I: Digital Channel Signal Types
Topic 3J: Signaling System 7

Lesson 4: OSI and TCP/IP
Topic 4A: OSI Reference Model Overview
Topic 4B: What is TCP/IP?
Topic 4C: TCP/IP Architecture
Topic 4D: TCP/IP: Addressing, Subnetting, and Routing
Topic 4E: Application and Internet Layer Protocols

Lesson 5: Real Time Transport Protocol
Topic 5A: RTP
Topic 5B: RTCP

Lesson 6: VoIP Network Architecture
Topic 6A: H.323 Architecture
Topic 6B: H.323 Signaling Overview
Topic 6C: Session Initiation Protocol
Topic 6D: Gateway Control Protocols

Lesson 7: Quality of Service
Topic 7A: Quality of Service Issues
Topic 7B: QoS Technology Solutions

Lesson 8: Cisco Voice Products
Topic 8A: Setting Up Your 2600 and 3600 Series Routers for Voice Over IP
Topic 8B: Setting Up Your AS5300 Access Server for Voice Over IP

Lesson 9: Configuring the Cisco 2600 and 3600 Series Routers for VoIP
Topic 9A: Voice Port Configuration
Topic 9B: Configuring POTS and VoIP Dial Peers

Lesson 10: Network Design and Architecture
Topic 10A: Six-step Design Process
Topic 10B: Current Network Audit
Topic 10C: Network Objectives
Topic 10D: Technologies and Services Review
Topic 10E: Technical Guidelines
Topic 10F: Capacity Planning
Topic 10G: Financial Analysis

Appendix A: H.323 Direct Endpoint Signaling

 
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