VoIP Performance Management and Optimization
A KPI-based approach to managing and optimizing VoIP networks
IP Communications
Adeel Ahmed, CCIE® No. 4574
Habib Madani
Talal Siddiqui, CCIE No. 4280
VoIP Performance Management and Optimization is the first comprehensive, expert guide to managing, monitoring, troubleshooting, and optimizing large VoIP networks. Three leading Cisco VoIP experts bring together state-of-the-art techniques for ensuring that customer service level agreements (SLA) are consistently met or exceeded.
The authors begin by reviewing how VoIP is deployed in enterprise and service provider networks and the performance tradeoffs and challenges associated with each leading VoIP deployment model. Next, they present a comprehensive approach to diagnosing problems in VoIP networks using key performance indicators (KPI) and proactively addressing issues before they impact service.
In this book, you will find a proven tools-based strategy for gauging VoIP network health and maximizing performance and voice quality. You also will learn how to perform trend analysis and use the results for capacity planning and traffic engineering-thereby optimizing your networks for both the short- and long-term.
The authors all work in the Cisco Advanced Services Group.
- Deploy, manage, monitor, and scale multivendor VoIP networks more effectively
- Integrate performance data from multiple VoIP network segments and service flows to effectively manage SLAs
- Use performance counters, call detail records, and call agent trace logs to gauge network health in real time
- Utilize dashboards to analyze and correlate VoIP metrics, analyze trends, and plan capacity
- Implement a layered approach to quickly isolate and troubleshoot both localized and systemic problems in VoIP networks
- Optimize performance in networks where the service provider owns the "last mile" connection
- Improve performance when VoIP is deployed over publicly shared infrastructure
- Manage performance in enterprise networks using both centralized and distributed call processing
- Plan media deployment for the best possible network performance
- Monitor trends, establish baselines, optimize existing resources, and identify emerging problems
- Understand and address common voice quality issues
This IP communications book is part of the Cisco Press® Networking Technology Series. IP communications titles from Cisco Press help networking professionals understand voice and IP telephony technologies, plan and design converged networks, and implement network solutions for increased productivity.
Category: Networking: Unified Communications
Covers: Voice over IP Network Management
Autorentext
Adeel Ahmed, CCIE No. 4574, is a senior manager in the Cisco Advanced Services group. He has been with Cisco for more than 11 years. His areas of expertise include Access/Dial, Broadband Cable, SP Voice, and IPv6. He has worked with major cable MSOs in North America, EMEA, and ASIAPAC in designing and troubleshooting cable networks. He has written several white papers and design guides used by customers, sales teams, and Cisco engineers in deploying multiservices over cable networks. He has represented Cisco at industry technical forums such as IETF, APRICOT, SCTE, CableLabs, NCTA, NAv6TF, Networkers, and Global IPv6 Summit. He is the coauthor of Deploying IPv6 in Broadband Access Networks. Adeel holds a bachelor's and a master's degree in electrical engineering.
Habib Madani works as a network consulting engineer in the Cisco Advanced Services group. He has been with Cisco for the past five years; before that, he worked for more than ten years as a lead engineer at Yahoo!, CenterPoint Broadband Technology, and Motorola. His background is SP VoIP, Data Center, Network Management, and OSS solutions. He has worked with major enterprise customers and MSOs in the United States and abroad across these segments. He has represented Cisco at industry technical forums such APRICOT and Networkers. Habib holds a bachelor's degree in electrical engineering from the University of Arizona and a master's in electrical engineering and computer science from the University of Illinois.
Talal Siddiqui,CCIE No. 4280, is a senior manager in the Cisco Advanced Services group. He has been with Cisco for 13 years. He has been involved with beachhead customers who were deploying these solutions for the past 12 years. As a consulting engineer, he has worked with MSOs, CLECs, and ILECs who have deployed Cisco SS7 Interconnect Solutions through planning, designing, deploying, network expansion, and operational troubleshooting phases. As a technical leader in Unified Communications Practice, he worked with Cisco partners in planning, designing, and deploying IP telephony solutions for large enterprise customers. Currently he is working on developing service offerings for Communication/Collaboration Enabled Business Process (CEBP) solutions and service delivery tools. Talal holds BSEE and MBA degrees and is a CCIE.
Inhalt
Foreword
Introduction
Part I VoIP Networks Today
Chapter 1 Voice over IP (VoIP) and Network Management 1
VoIP Technology 2
VoIP Overview 3
Media Transport Protocol for VoIP-RTP 5
VoIP Signaling Protocols 8
Common Network Problems in VoIP Networks 9
Delay/Latency 9
Propagation Delay 10
Processing Delay 10
Serialization/Queuing Delay 11
Jitter 11
Packet Loss 12
Voice Activity Detection (VAD) 13
Other Issues 13
Common Voice Quality Problems in IP Networks 14
Strategic Importance of VoIP and Management 18
Network Management Methodologies 20
Telecommunications Management Network 20
FCAPS Model 21
Fault Management 21
Configuration Management 21
Accounting Management 22
Performance Management 22
Security Management 22
Information Technology Infrastructure Library (ITIL) 23
Service Strategy 23
Service Design 24
Service Transition 25
Service Operation 26
Continual Service Improvement 27
Enhanced Telecom Operations Map (eTOM) 27
Comprehensive Network Management Methodology 28
Focusing on Performance Metrics 30
Summary 32
Reference 32
Chapter 2 A Metrics-Based Approach for Managing the VoIP Network 33
VoIP Networks Require a Layered Management Approach 34
Tracking Systemic Performance Issues 37
Localized Performance Issues 39
Subjective Performance Issues 39
Downtime and Impact 40
Proactive Monitoring Concept 41
KPIs 43
VoIP-Signaling KPIs 44
VoIP Media KPIs 45
VoIP Network Segments and VoIP Service Flows 46
Voicemail Segment 46
Announcement Segment 47
Voice Termination Point Segment 47
Voice ONNET Call Leg Segment 47
Voice OFFNET or PSTN-Bound Segment 47
PSTN Bearer Traffic Segment 48
Service-Level Agreement (SLA) Management 48
SBC Trunk Uptime 50
PSTN/IMT Trunk Uptime 50
Signaling SS7 Link Uptime 50
Vendor Accountability 51
Tools Utilized 51
Summary 52
Reference 52
Part II VoIP Deployment Models
Chapter 3 VoIP Deployment Models in Service Provider Networks 53
Service Provider Voice Implementation Models 54
Residential Applications: Voice over Broadband 55
Small/Medium Business Applications (Voice over T1/E1/PRI/CAS) 58
IP Trunks 59
Session Bor…