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Cover image for Voice enabling the data network : H.323, MGCP, SIP, QoS, SLAs, and security
Title:
Voice enabling the data network : H.323, MGCP, SIP, QoS, SLAs, and security
Personal Author:
Publication Information:
Indianapolis, IN : Cisco Press, 2003
ISBN:
9781587050145
Subject Term:

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30000010129291 TK5105.8865 D87 2003 Open Access Book Book
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Summary

Summary

Assist Telco and ISP engineers and technicians in their transition to IP telephony Assists traditional telco engineers and technicians in designing, implementing, and supporting VoIP networks Provides a step-by-step approach to designing a VoIP network Outlines each VoIP technology components with detailed descriptions of possible applications Provides a thorough description of Voice over IP for those new to the technology Voice over IP (VoIP) is a fast-growing technology within telcos and ISPs. VoIP is significantly reducing the cost of transmitting telephone calls and enabling small companies to enter the +$50 billion marketplace. Many telcos and ISPs are entering this market while VoIP is still in its infancy. As a result, there is an urgent need for telco and ISP engineers to learn this new technology. This book will assist telco engineers to transition to IP networking with a focus on VoIP networks. This book introduces the fundamentals of IP networking as it applies to transmitting voice calls using IP packets. Key telco-based technologies such as SS7 are reviewed. A unique approach is that the book outlines each component of VoIP technology while describing the application of the technology. This is accomplished by describing key steps in designing an operational VoIP network, thereby enabling the reader to understand how this technology is applied.


Author Notes

James F. Durkin has been working in the industry with voice and data technologies for over 13 years. Jim graduated from Georgia Institute of Technology with bachelor's and master's degrees in electrical engineering. Jim worked for Hitachi Telecom and for Scientific Research Corporation as a systems engineer, designing and supporting multiservice networks and network management systems. He was a principal representative for the following standards organizations: ANSI T1S1, Network Management Forum, and ATM Forum. Currently, Jim works as a systems engineer for Cisco Systems responsible for selling and supporting optical network solutions.


Table of Contents

1 The Telephony Service Provider: An Overview
Motivation for IP and Voice Convergence
VoIP Services on the Rise
Wholesale VoIP Service
Retail VoIP Service
Successful VoIP Deployments
The VoIP Network Architecture: Gateways and Gatekeepers
Seven Steps in Designing and Implementing a VoIP Network
Summary
2 VoIP Network Architectures: H.323, SIP, and MGCP
H.323 VoIP Network Architecture
H.323 VoIP Services
H.323 VoIP Architecture Components
Gateway
Gatekeeper
Gateway and Gatekeeper Signaling
RAS. H
225 H
245 RTP. Directory Gatekeeper
SS7 Interconnection (PGW 2200 and SLT). VoIP Application Servers
SIP Network Architecture
SIP Network Services
SIP Network Architecture Components
SIP User Agents
SIP Gateways
SIP Servers
SIP Signaling Messages
H.323 and SIP Network Interworking
Softswitch Network Architecture
Softswitch Network Services
Softswitch Architecture Components
Softswitch
Call Agent Signaling
Gateways
Aggregation and Edge Routers
Feature Servers
Summary
3 Offering Wholesale VoIP Services
Migrating Toward a VoIP Infrastructure
Wholesale Peering Arrangements
Call Routing
SS7 Interconnection to the PSTN
VoIP Billing Systems
Summary
4 Offering Bundled Voice and Data Services
Overview of Managed Voice and Data Services
Integrated Access Architectures
Managed Voice and Data Services Using AAL2
Fundamentals of AAL2
Summary
5 QoS Considerations in VoIP Network Design
IP Network Characteristics
Delay
Jitter
Packet Loss
Using QoS to Support VoIP Services
Choosing the Right QoS Approach
Overprovisioning
IntServ
DiffServ
QoS Building Blocks
Using DiffServ for VoIP Services: The EF Behavior
Implementing the EF Behavior
Dial Peer and NBAR
CB-Marking
QPPB: QoS Policy Propagation Through BGP
Congestion Management Using LLQ for VoIP
Avoiding Congestion in VoIP Networks
CAC for VoIP Networks
Local CAC. Network CAC
RSVP CAC
MPLS Supporting Voice
MPLS TE
Fast Re-Route for Voice
Summary
6 Implementing the PSTN Switch/VoIP Gateway Trunk
Overview of VoIP Gateway to PSTN Connectivity
Circuit Types
Signaling Types
Case Study: JIT VoIP Network
T1, E1, and DS3 Fundamentals
Using T1s to Interconnect to the PSTN
Using E1s to Interconnect to a PSTN
Using DS3s to Interconnect to the PSTN
T1 CAS Trunks
T1 CAS Trunk Template
Signal Type
Line Code Method
Framing Mode
Incoming and Outgoing Digit Format
PRI Trunks
Q
921 Q
931 PRI Trunk Template
ISDN Variant
NFAS
Digit Sending Method
Incoming and Outgoing Digit Format
SS7 to Interconnect to the PSTN
SS7 Trunk Template
Mode
ISUP Variant
Signaling Speed
Signaling Channel
Point Codes
Network Indicator
CIC Mapping
Troubleshooting Techniques
Ensure Line Is up and Correct Synchronization and Clocking
Ensure D Channel Is up and Correct PRI Signaling
Ensure No Alarms
Loopback Test
CAS Troubleshooting
Summary
7 Gateway and Gatekeeper Design Requirements
Gateway and Gatekeeper Design
Traffic Engineering
Erlangs
Trunk Sizing
Zones
Dial Peers
Normalization Rules
Dial Plan Administration
Gatekeepers and Directory Gatekeeper Sizing
High-Availability VoIP Network
Gateway High Availability
Gatekeeper High Availability
DGK High Availability
Troubleshooting Gateways and Gatekeepers
Summary
8 Security Considerations for VoIP Networks
H.323 RAS Authentication
Network Access Security
Device Security
Using IPSec for Additional Security
Summary
9 Network Management: Maintaining an SLA
Overview of Ma
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