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Accurate VoIP monitoring is the key to good troubleshooting. Observer provides visibility into the network, application, and VoIP traffic to quickly resolve issues. The VoIP Expert provides summary views to easily understand overall VoIP network health. Track over 70 VoIP-specific metrics on an aggregate or per-call basis.
 VoIP Expert Analysis Features
- Convenient at-a-glance summaries
- VoIP Traffic Summary
- Call Summary
- Voice Quality Scoring
- Precedence (QoS)
- Detailed views with in-depth Call Detail Records
- Addresses
- Status (Open, closed, fail)
- Number of packets, packet bytes, packet loss
- Start time, initial setup duration, duration
- Current jitter, maximum jitter
- MOS, R-factor
- QoS for each call
- Number of packets that arrive out of order
- Detailed analysis for packet loss and delay
- Gap and burst measurements
- Long-term trending can now be performed on Call Details Records (New)
 Quickly Solve Problems with over 50 VoIP Experts
Observer offers over 50 event-based and threshold-based VoIP Experts to immediately flag problems for faster problem resolution. Examples include:
• Alarms for unacceptable jitter level
• Lost packets
• Alterations in the QoS stream
Share VoIP Reports With Others
Through a web browser, engineers can generate and view a variety of reports on VoIP performance statistics and call quality scoring. Share reports across the company and schedule automatic e-mails to management.
 Manage VoIP Audio Quality
Observer displays the individual Mean Opinion Score (MOS) and R-factor for every call and as an average for all calls. Place alarms on this score to proactively manage overall VoIP quality.
Learn more about call scoring:
Factors that measure call scoring within Observer can be customized depending upon the network’s specific VoIP equipment and overall network characteristics. For example, VoIP calls made on the factory floor may be scored differently than a call made within a small, quiet office.
Quality score impairment factors include:
- Loudness rating
- Talker Echo Loudness Rating
- Circuit noise
- Floor noise
- Coding and decoding delay
Monitor Quality of Service (QoS)
Observer’s VoIP monitoring solution reports QoS levels by call, packet, and protocol. View percentage of VoIP utilization compared to overall traffic for planning network upgradess.
QoS standards recognized include:
- Default: RFC 1349, 1195, 1123, 791
- OSPF V2: RFC 1248, 1247
- DSCP: RFC 2474
VoIP Expert includes call ID and stream information including:
 Evaluate Jitter
Observer’s VoIP Expert displays the statistical variance of packet arrival times, also known as jitter, measured in timestamp units or RTP time units.
Measure Bursts and Gaps
Observer’s VoIP monitoring tools provide comprehensive metrics for monitoring bursts (periods characterized by high rates of packet loss), and gaps (periods characterized by low rates of packet loss). Burst and gap percentages quickly indicate call quality.
Track and Decode VoIP and Video
Observer offers complete VoIP and video decodes, including H.323, Session Initiation Protocol (SIP), MGCP, and SCCP (Cisco "skinny"). Observer also supports Avaya CCMS, Nortel UNIStim, and Mitel® systems.
Nortel UNIStim licensed separately
Reconstruct and Review VoIP Calls
Reconstruct calls to review and hear quality issues experienced by users.
Compare VoIP to Network Performance
Observer tracks VoIP and overall network performance. It identifies whether jitter or delay is caused by other applications on the network.
Monitor VoWLAN
With the Network Instruments Distributed Network Analysis (NI-DNA) architecture, Observer’s VoIP enhancements are automatically available across topologies. Observer’s VoIP Expert monitors VoIP traffic even over wireless networks.
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