Transcript Slide 1

Quality of Service in
VoIP Network Deployment
Sid Nag
Founder & CEO – Prominence Networks
www.prominencenet.com
Questions to Explore Today
 What are the basic QoS measurements?
 What is the effect of poor network QoS on realtime applications?
 Options for measuring and reporting QoS?
 How can you implement and manage QoS for the
full “life cycle” of your project?
Basic QoS Measurements
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Network latency
Jitter
Packet Loss
Sequential Packet Loss
Effect of Poor QoS
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Voice traffic has stringent delay and jitter requirements at each hop
Video traffic is extremely sensitive to poor quality, especially packet loss
Voice and video traffic have extremely different network characteristics
Voice
Video
Large number of terminals,
large call volumes, and short
calls
Fewer endpoints, smaller call
volumes, longer duration “calls”
Large number of small
packets
Large and varying packets sizes
Well understood calling
patterns
Scheduled and ad-hoc calls
Options for Measuring and Reporting
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End station reporting
Routers collecting information
Test probes placed in the network
MOS scoring
Full Life Cycle QoS
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Assessment
Engineering
Provisioning
Monitoring
Management
Assessment - Integrated Test Probes
Simulated voice packets provide real-time information
Probe
Generates
RTP-like
Packets
Integrated
Probe
Test traffic frequency
should be
configurable from
Management Station
Probe
Analyzes
RTP-like
Packets
Network Path
Centralized Manager
Test
Traffic
Parameters
Fault
Management
Integrated
Probe
Threshold Alerts for:
• Delay
• Jitter
• Packet Loss
• Seq. Packet Loss
Uses:
• Baseline studies
• SLA management
Engineering & Provisioning QoS
 End to End Network View
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Network Topology Map
 Path Provisioning
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Automated or Manual
Static Routes or IGP
 Automated Provisioning
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Determines Optimal
Paths
 Real-Time Analysis Tools
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Route Analysis
Trace Route
Path Analysis
Monitoring and Managing QoS
Centralized, end-to-end control of remote devices and applications
Management, monitoring, control
Operations
Center
PSTN
Legacy PBX
IP
PBX
Application
Endpoints Voice,
Video
Application
Endpoints Voice,
Video
Enterprise IP Network
Summary
 Poor QoS is detrimental to your users
 Methods exist to monitor and manage QoS
 Choose a product which enhances the full QoS
implementation and management life cycle