Steps in Implementing VoIP Assess network readiness for voice, audio, video Real-time monitoring of call quality, server health, & network performance Test and tune networks and equipment Isolate faults and determine the cause of problems Assess - Test - Monitor - Diagnose
Assessing VoIP Readiness
Most VoIP deployments start with hit-or-miss pilots
Expensive and time consuming
Qualitative – “How did the calls sound to you? Is it reliable?”
Deployments are long, tedious, and disruptive
Evaluate the data network’s ability to support VoIP before deploying or even buying VoIP equipment
Key Aspects of an Assessment
Is device configuration capable of VoIP?
Is there enough bandwidth available for the calls I need?
Device CPU usage
Is the CPU usage too high?
Should be done before deploying or even buying VoIP equipment
Is the call quality acceptable?
Measure network statistics that impact VoIP
Jitter, one-way delay, lost packets
Determine how many VoIP channels a network can support
Measure the effect of VoIP on other applications
NetIQ’s Vivinet Assessor
Discovers and reports network device configuration
Assesses VoIP readiness of routers, switches and links
Emulates VoIP traffic to predict call quality
Models VoIP bandwidth on WAN links
Raleigh Houston Portland San Jose IP WAN Vivinet Assessor
Vivinet Assessor Benefits
Identifies network devices and links that support VoIP
Measures call quality by time and location
Helps make CODEC tradeoffs between quality and bandwidth
Measures effectiveness of QoS
Creates polished assessment reports…
Assessment Reports provide a “Go/No Go” recommendation … all BEFORE deploying the first VoIP phone
Failed the Assessment?
Different network architecture
Apply Quality of Service (QoS)
Tuning VoIP Traffic for the Data Network
Emulate VoIP traffic repeatably
Quality of Service: DiffServ/ToS, RSVP, MPLS, …
What if: see effects of changing VoIP characteristics
Try different codecs, silence suppression
Adjust delay between packets, adjust jitter buffer sizes
Look at effect across many locations
What happens as peak call volume is reached?
What happens to the other applications?
Will Your Network Changes Work?
How do you achieve optimal VoIP quality and reliability?
Will your changes improve network performance?
How effective is QoS?
Will VoIP affect other networked applications?
Measures end-to-end, network performance from the application layer
Evaluates the impact of network changes
Emulates both VoIP and non-VoIP traffic, in the lab
Tests VoIP-enabled network equipment
Evaluates the effectiveness of QoS and assists in QoS tuning
Tests the capacity of the network
Evaluate potential resolutions to problems uncovered by Vivinet Assessor
Validate proposed network and equipment changes
Understand performance impact of other network elements, such as VPNs and firewalls on VoIP traffic
Verify that prioritization techniques work as planned using both VoIP and non-VoIP traffic
Can you effectively troubleshoot?
Root causes of call quality issues are often elusive
Skills, expertise and tools needed to solve problems may not be available
Troubleshooting is costly, both in time and money
Inability to identify and fix problems stalls VoIP deployment
NetIQ’s Vivinet Diagnostics
Requires just two phone numbers or IP addresses
Analyzes the network path between phones
Gathers detailed performance data about the routers, switches, links and voice gateways
Identifies causes of specific call quality problems using built-in Knowledge Engine
Lists and prioritizes problems
Vivinet Diagnostics Benefits
Cuts down on time spent resolving voice quality issues
Reduces skills needed for troubleshooting
Minimizes tools required
Enables troubleshooting in both pre- and post-deployment environments
Requires minimal configuration
Can You Meet Voice and Video Availability and Quality Needs?
Will you be able to meet high reliability expectations?
Can you ensure your IP telephony systems and video networks deliver the highest quality for users?
Can you maintain required service levels?
Will your management be proactive or reactive?
Assuming you already manage routers and switches, focus on
Monitoring a VoIP System
Real-time monitoring and management of IP telephony systems and VoIP networks
Robust alert management and notification
Forward alerts via email, pager, SNMP
Forward alerts to systems management console
Automatic alert escalation
Automate problem management
Initiate corrective actions based on threshold conditions
Monitoring Call Quality
Monitor VoIP Call Quality
Active: Drive VoIP traffic between key points in the network
Passive: Examine Call Detail records
Report on call quality: MOS, one-way delay, jitter, & packet loss
Troubleshoot VoIP quality issues without impacting servers
Identify Call Quality Issues Before Users Complain
Diagnose problems and pinpoint devices that are problematic
Measure network performance factors that impact VoIP
Alerts on impending performance issues
NetIQ’s Vivinet Manager
Easy-to-use web-based console
Integrates with your current management system
Automates operations and monitoring policies
Automated problem management includes sophisticated alerting and auto-resolution capabilities
Powerful out-of-the-box reporting of call quality, usage trends, overall performance and capacity planning
NetIQ’s Vivinet Manager Benefits
Simplifies voice and video management
Maximizes performance and uptime
Lowers support costs
Rapidly identify critical problems
Manage from anywhere
Stay on top of your voice and video environment
For More Information
White papers –
Checklist of VoIP Network Design Tips
A Handbook for Successful VoIP Deployment: Network Testing, QoS, and More