VoIP and Unified Communications Internet Telephony and the Future Voice Network

ISBN-10: 1118019210

ISBN-13: 9781118019214

Edition: 2012

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Description: The new generation of voice services and telephony will be based on packet networks rather than TDM transmission and switching. This book addresses the evolution of telephony to Voice over IP (VoIP) and Unified Communications (UC), bringing email, voice mail, fax, and telephone services to one user interface. Concise and to the point, this text tells readers what they need to know to deal with vendors, network engineers, data center gurus, and top management with the confidence and clear understanding of how things really work. It serves as a useful tool for engineers just entering the field, as well as for experienced engineers and technical managers who want to deal effectively with sales people.

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Book details

List price: $55.50
Copyright year: 2012
Publisher: John Wiley & Sons, Limited
Publication date: 4/13/2012
Binding: Paperback
Pages: 320
Size: 6.00" wide x 9.50" long x 1.00" tall
Weight: 1.144
Language: English

Preface
Acknowledgments
IP Technology Disrupts Voice Telephony
Introduction to the Public Switched Telephone Network
The Digital PSTN
The Packet Revolution in Telephony
Summary of Packet Switching
Link Capacity: TDM versus Packets
VoIP and "The Cloud"
IN SHORT: Reading Network Drawings
Traditional Telephones Still Set Expectations
Availability: How the Bell System Ensured Service
Call Completion
Sound Quality: Encoding for Recognizable Voices
Low Latency
Call Setup Delays
Impairments Controlled: Echo, Singing, Distortion, Noise
From Circuits to Packets
Data and Signaling Preceded Voice
X.25 Packet Data Service
SS7: PSTN Signaling on Packets
ISDN
Putting Voice into Packets
Voice Encoding
Dicing and Splicing Voice Streams
The Latency Budget
Packet Transmission and Switching
The Physical Layer: Transmission
IN SHORT: The Endian Wars
Data Link Protocols
IP, the Network Protocol
Layer 4 Transport Protocols
Transmission Control Protocol
User Datagram Protocol
Stream Control Transmission Protocol
Higher Layer Processes
RTP
RTCP
Multiplexing RTP and RTCP on One UDP Port
RTP Mixers and Translators
Layered Encoding
Profiles for Audio and Video Conferences
Security via Encryption
IN SHORT: Public Key Infrastructure (PKI)
Saving Bandwidth
Voice Compression
Header Compression
Silence Suppression, VAD
Sub-Packet Multiplexing
Protocol and Codec Selection
Differences: Circuit versus Packet Switched
Power to the Desktop Phone
Phone as Computer and Computer as Phone
Length of a Phone Line
Scaling to Large Size
Software Ownership and Licenses
VoIP Signaling and Call Processing
What Packet Voice and UC Systems Share
Session Initiation Protocol (SIP)
SEP Architecture
SIP Messages
SIP Header Fields and Behaviors
Session Description Protocol
IN SHORT: ABNF
Media Gateway Control Protocol
MGW Functions
MGW Connection Model
Megaco Procedures
Megaco Details
Signaling Conversion
Voice Transcoding
H.323
H.323 Architecture
Gatekeeper
Gateway
Terminal
Multipoint Control Unit
Call Procedures
Directory Services
Domain Name Service (DNS)
ENUM
VoIP and Unified Communications Define the Future
Voice as Before, with Additions
Legacy Services to Keep and Improve with VoIP
Flexible Call Routing and 800 Numbers
Call on Hold
Call Transfer
Call Forwarding
Audio Conferencing
Video Conferencing
Local Number Portability
Direct Inward Dialing, Dialed Number Indication
Call/Message Waiting
Call Recording
Emergency Calling (E911)
Tracking IP Phone Locations for E911
Facsimile Transmission
Facsimile on the PSTN
Real-Time Fax over IP: Fax Relay or T.38
Store-and-Forward Fax Handling
IP Faxing over the PSTN
Phone Features Added with VoIP/UC
Presence
Forking
Voicemail = eMail
SMS Integration
Instant Messaging
Webinar Broadcasts
Telepresence
More UC Features to Consider
How VoIP and UC Impact the Network
Space, Power, and Cooling
Priority for Voice, Video, Fax Packets
Packets per Second
Bandwidth
Security Issues
Eavesdropping and vLAN Hopping
Access Controls for Users and Connections
Modems
DNS Cache Poisoning
IN SHORT: Earliest Instance of DNS Cache Poisoning
Toll Fraud
Pay-per-Call Scams
Vishing
SIP Scanning/SPIT
Opening the Firewall to Incoming Voice
First Migration Steps While Keeping Legacy Equipment
Circuit-Switched PBX
Digital Phones
Analog Phones and FX Service
Facsimile Machines
Modems
Interconnections to Global Services
Media Gateways
SIP Trunking
Operating VoIP Across Network Address Translation
Failures of SIP, SDP (Signaling)
Failures of RTP (Media)
Solutions
STUN: Session Traversal Utilities for NAT
TURN: Traversal Using Relays around NAT
ICE: Interactive Connectivity Establishment
Session Border Controller
Enterprise SBC
Carrier SBC
Supporting Multiple-Carrier Connections
Mobility and Wireless Access
VoIP on Wireless LANs/Wi-Fi
Integration of Wi-Fi and Cellular Services
Packet Voice on Mobile Broadband: WiMAX, LTE
Radio over VoIP
IN SHORT: E&M Voice Signaling
Network Management for VoIP and UC
Starting Right
Acceptance Testing
Configuration Management and Governance
Privilege Setting
Continuous Monitoring and Management
NMS Software
Simple Network Management Protocol
Web Interface
Server Logging
Software Maintenance
Quality of Service/Experience Monitoring
Validate Adjustments and Optimization
Troubleshooting and Repair
Methods
Software Tools
Test Instruments
Cost Analysis and Payback Calculation
Examples of Hardware and Software
IP Phones
Gateways
Session Border Controllers
Call-Switching Servers
IP PBX
Conference Bridges/Controllers
Call Recorder
Hosted VoIP/UC Service
Management Systems/Workstations
Appendixes
Acronyms and Definitions
Reference Documents
RFCs
ITU Recommendations
Other Sources
Message and Error Codes
Index
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