Carrier Grade Voice Over IP (eBook)

Carrier Grade Voice Over IP
By:Collins, Daniel;
Pub Date:October 8th 2002
Format:Electronic book text 522 pages
ISBN:0071501118 / 9780071501118
Your Price:$65.00 ADD TO CART
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Main description

In 2002 voice over IP will constitute more than 25% of all long distance voice calls, according to Network World. That's more than a 30% ramp-up from 2001. The emergence of SIP, MPLS and new quality of service tools is making carrier grade voice over IP a service reality, and a potentially huge margin booster and revenue driver for service providers. The first edition of Carrier Grade Voice over IP played a roll in VoIP growth, in less than year becoming an essential tool for carriers working to provide high quality IP telephony. This new edition vastly updates the SIP chapter, details MPLS, and takes the explanations of the previous edition a step further in a final chapter that shows, step by step, how to design working VoIP networks.


Table of contents

CHAPTER 1: INTRODUCTION

What is Meant by Carrier-Grade?

What is Meant by VoIP?

A Little About IP

Why VoIP?

Why Carry Voice?

Why Use IP for Voice?

Lower Equipment Cost

Voice/Data Integration and Advanced Services

Potentially Lower Bandwidth Requirements

The Widespread Availability of IP

The VoIP Market

VoIP Challenges

Speech Quality

Managing Access and Prioritizing Traffic

Speech-Coding Techniques

Network Reliability and Scalability

Overview of the Following Chapters

CHAPTER 2: TRANSPORTING VOICE BY USING IP

Overview of the IP Protocol Suite

Internet Standards and the Standards Process

The Internet Society

The Internet Architecture Board (IAB)

The Internet Engineering Task Force (ETF)

The Internet Engineering Steering Group (ESG)

The Internet Assigned Numbers Authority (IANA)

The Internet Standards Process

The Internet Prototol (IP)

The IP Header

IP Routing

The Transmission Control Protocol (TCP)

The TCP Header

TCP Connections

The User Datagram Protocol (UDP)

Voice over UDP, not TCP

The Real-Time Transport Protocol (RTP)

RTP Payload Formats

The RTP Header

Mixers and Translators

The RTP Control Protocol (RTCP)

RTCP Sender Report (SR)

RTCP Receiver Report (RR)

RTCP Source Description Packet (SDES)

RTCP BYE Packet

Application-Defined RTCP Packet

Calculating Round-Trip Time

Calculating Jitter

Timing of RTCP Packets

IP Multicast

IP Version 6 (IPv6)

IPv6 Header

IPv6 Addresses

IPv6 Header Extensions

Interworking IPv4 and IPv6

CHAPTER 3: SPEECH-CODING TECHNIQUES

Voice Quality

A Little About Speech

Voice Sampling

Quantization

Types of Speech Coders

G.711

Adaptive Differential PCM (ADPCM)

Analysis-by-Synthesis (AbS) Codecs

G.728 Low-Delay CELP (LD-CELP)

G.723.1 Algebraic Code-Excited Linear Prediction (ACELP)

G.729

Selecting Codecs

Cascaded Codecs

Tones, Signals, and Dual-Tone Multifrequency (DTMF) Digits

CHAPTER 4: H.323

The H.323 Architecture

Overview of H.323 Signaling

Overview of H.323 Protocols

H.323 Addressing

Codecs

RAS Signaling

Gatekeeper Discovery

Endpoint Registration and Registration Cancellation

Endpoint Location

Admission

Bandwidth Change

Status

Disengage

Resource Availability

Service Control

Request in Progress

Call Signaling

Setup

Call-Proceeding

Alerting

Progress

Connect

Release Complete

Facility

Interaction Between Call Signaling and H.245 Control Signaling

Call Scenarios

Basic Call Without Gatekeepers

A Basic Call with Gatekeepers and Direct Endpoint Call Signaling

A Basic Call with Gatekeeper/Direct Routed Call Signaling

A Basic Call with Gatekeeper-Routed Call Signaling

Optional Called-Endpoint Signaling

H.245 Control Signaling

H.245 Message Groupings

The Concept of Logical Channels

H.245 Procedures

Fast Connect Procedure

H.245 Message Encapsulation

Conference Calls

Pre-arranged Conference

Ad Hoc Conference

The Decomposed Gateway

CHAPTER 5: THE SESSION INITIATION PROTOCOL (SIP)

The Popularity of SIP

The SIP Architecture

SIP Network Entities

SIP Call Establishment

SIP Advantages over Other Signaling Protocols

Overview of SIP Messaging Syntax

SIP Requests

SIP Responses

SIP Addressing

Message Headers

Examples of SIP Message Sequences

Registration

Invitation

Termination of a Call

Redirect and Proxy Servers

Redirect Services

Proxy Servers

The Session Description Protocol (SDP)

The Structure of SDP

SDP Syntax

Usage of SDP with SIP

Negotiation of Media

SIP Extensions and Enhancements

The SIP INFO Method

SIP Event Notification

SIP for Instant Messaging

The SIP REFER Method

Reliability of Provisional Responses

The SIP UPDATE Method

Integration of SIP Signaling and Resource Management

Usage of SIP for Features and Services

Call Forwarding

Consultation Hold

Interworking

PSTN Interworking

Interworking with H.323

Summary

CHAPTER 6: MEDIA GATEWAY CONTROL AND THE SOFTSWITCH ARCHITECTURE

Separation of Media and Call Control

Softswitch Architecture

Requirements for Media Gateway Control

Protocols for Media Gateway Control

MGCP

The MGCP Model

MGCP Endpoints

MGCP Calls and Connections

Overview of MGCP Commands

Overview of MGCP Responses

Command and Response Details

Call Setup Using MGCP

MGCP Events, Signals, and Packages

Interworking Between MGCP and SIP

MEGACO.248

MEGACO Architecture

Overview of MEGACO Commands

Descriptors

Packages

MEGACO Command and Response Details

Call Setup Using MEGACO

Interworking Between MEGACO and SIP

CHAPTER 7: VoIP and SS7

The SS7 Protocol Suite

The Message Transfer Part (MTP)

ISDN User Part (ISUP) and Signaling Connection Control Part (SCCP)

SS7 Network Architecture

Signaling Points (SPs)

Signal Transfer Point (STP)

Service Control Point (SCP)

Message Signal Units (MSUs)

SS7 Addressing

ISUP

Performance Requirements for SS&

Sigtran

Sigtran Architecture

SCTP

M3UA Operation

M2UA Operation

M2PA Operation

Interworking SS7 and VoIP Architectures

Interworking Softswitch and SS7

Interworking H.323 and SS7

CHAPTER 8: QUALITY OF SERVICE (QoS)

The Need for QoS

End-to-End QoS

It's Not Just the Network

Overview of QoS Solutions

More Bandwidth

QoS Protocols and Architectures

QoS Policies

The Resource Reservation Protocol (RSVP)

RSVP Syntax

Establishing Reservations

Reservation Errors

Guaranteed Service

Controlled-Load Service

Removing Reservations and the Use of Soft State

DiffServ

The DiffServ Architecture

The Need for SLAs

Per-Hop Behavior (PHB)

Multiprotocol Label Switching (MPLS)

The MPLS Architecture

FEC and Label Formats

Actions at LSRs

MPLS Traffic Engineering

Label Distribution Protocols and Constraint-Based Routing

RSVP Traffic Engineering (RSVP-TE)

Combining QoS Solutions

CHAPTER 9: DESIGNING A VOICE OVER IP NETWORK

Design Criteria

Build-Ahead or Capacity Buffer

Fundamental Technology Assumptions

Network-Level Redundancy

Voice Coder/Decoder (Codec) Selection Issues

Blocking Probability

QoS Protocol Considerations and Layer 2 Protocol Choices

Product and Vendor Selection

Generic VoIP Product Requirements

Element Management

Traffic Forecasts

Voice Usae Forecast

Traffic Distribution Forecast

Node Locations and Bandwidth Requirements

MG Locations and PSTN Trunk Dimensioning

MSG, SG, and EMS Dimensioning and Placement

Calculating VoIP Bandwidth Requirements

Physical Connectivity

APPENDIX A: TABLE OF ERLANG B

APPENDIX B: VISUAL BASIC CODE FOR ERLANG CALCULATIONS

Glossary of Acronyms

References

Index


Backcover

Author Information

Downloads & Resources

Downloads



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