--- title: "Stop guessing: monitor the right VoIP and UC KPIs" description: Monitor the right KPIs to ensure VoIP and UC performance. 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[Manufacturers](https://www.teledynamics.com/manufacturers) - [Support](https://www.teledynamics.com/contentpages/helpdesk) - [Think Tank Blog](https://info.teledynamics.com/blog) ## TeleDynamics Think Tank # Stop guessing: monitor the right VoIP and UC KPIs Posted by [Daniel Noworatzky](https://info.teledynamics.com/blog/author/daniel-noworatzky) on Mar 25, 2026 10:25:00 AM ![](https://info.teledynamics.com/hubfs/Daniel%20N-2018%20Headshot-rdx.jpg) - [Tweet](https://twitter.com/share) ![Split image showing a frustrated videoconference attendee on one side, and a network engineer on the other side - TeleDynamics blog](https://info.teledynamics.com/hs-fs/hubfs/blog-images/UCKPIs_1200x630.jpg?width=1200&height=630&name=UCKPIs_1200x630.jpg) Your network can be “up” and still deliver a terrible user experience. Dropped calls, choppy audio, and lagging video often go undetected by traditional monitoring tools until users start complaining. The key is knowing which performance indicators truly reflect real-time communication quality. In this article, we break down the key performance indicators that matter most for VoIP and UC and how to use them to ensure a consistently high-quality experience. Network monitoring is a core responsibility for any administrator, but traditional approaches focused on uptime are no longer sufficient for real-time services like VoIP and unified communications (UC). These services are highly sensitive to performance fluctuations, meaning that availability alone does not guarantee quality. Maintaining a high quality of experience (QoE) requires monitoring the right key performance indicators (KPIs). ### MSPs: a unique perspective Managed service providers (MSPs) face additional challenges when monitoring VoIP and UC environments. Rather than managing a single network, MSPs are responsible for maintaining service quality across multiple customer environments, often over networks they do not fully control. In UCaaS deployments, endpoints connect over the public Internet to cloud-hosted platforms, making performance dependent on multiple external factors. As a result, MSPs must go beyond device and service availability and focus on end-to-end performance. KPI-driven monitoring is essential for maintaining consistent voice and video quality in these environments. While the principles discussed here apply broadly, they are especially relevant for MSPs tasked with delivering reliable communication services across diverse and distributed networks. ### Why traditional network monitoring is insufficient Traditional monitoring tools typically focus on device and service availability, often presenting a simple up/down status. While useful, this approach provides limited insight into performance issues that impact real-time services. Problems such as congestion, [routing inefficiencies](https://info.teledynamics.com/blog/minimize-jitter-latency-and-other-uc-issues-through-proper-routing), and delays in supporting services like DNS, NTP, or DHCP can degrade performance without triggering availability alerts. For VoIP and UC, where timing and consistency are critical, these issues can significantly impact user experience even when systems appear operational. ### The modern approach to network monitoring Effective monitoring of real-time services requires identifying performance degradation as it develops. This includes tracking latency, jitter, packet loss, and other[indicators that affect service quality](https://info.teledynamics.com/blog/essential-steps-for-applying-qos-on-uc-networks). Techniques such as [synthetic monitoring](https://info.teledynamics.com/blog/catch-voip-problems-before-they-happen-with-synthetic-monitoring) help simulate real user traffic and uncover issues before they impact users. In addition, monitoring quality-of-service (QoS) behavior, network paths, and application-layer performance provides a more complete view of how services are delivered. This multi-layered approach is essential for maintaining reliable VoIP and UC performance. ### Why VoIP and UC are different VoIP and UC traffic behaves differently from typical data traffic. These applications rely on real-time media streams and signaling exchanges, both of which are sensitive to delay, jitter, and packet loss. Because this traffic is carried over best-effort IP networks, even minor performance issues can result in noticeable degradation. Therefore, maintaining quality requires visibility into both network performance *and* application behavior. ### KPIs for UC and VoIP Real-time services require experience-focused metrics rather than generic network statistics. The goal is not just to confirm that services are available, but to ensure that they perform well from the user’s perspective. Core KPIs such as latency, jitter, packet loss, and mean opinion score (MOS) remain essential, as they directly impact QoE. However, additional metrics provide deeper insight into service performance, including: - Call setup success rate (CSSR) - Call drop rate - Round-trip time (RTT) to UC providers - RTP stream quality metrics - QoS queue performance and DSCP validation The following table outlines these KPIs, what they measure, and when they are most relevant. (Use the horizontal scroll bar at the bottom to see all the columns.) | KPI | What it measures | Why it matters for real-time communications | What it is most useful for | | --- | --- | --- | --- | | Latency (end-to-end delay) | Time taken for packets to travel from source to destination | High latency causes conversational delays and poor user experience in calls and meetings | VoIP and UC | | Jitter | Variation in packet arrival times | Excessive jitter leads to choppy audio, buffering, and distorted video streams. | VoIP and UC | | Packet loss | Percentage of packets that fail to reach the destination | High packet loss results in audio clipping, robotic voice, and video freezing. | VoIP and UC | | Mean opinion score (MOS) | Composite perceived call quality | It provides a user-centric quality indicator derived from latency, jitter, and loss. | VoIP and UC | | Call setup success rate (CSSR) | Percentage of successfully established calls or sessions | CSSR can identify signaling or connectivity issues affecting session initiation. | VoIP | | Call drop rate | Frequency of unexpectedly terminated calls | A high drop rate indicates instability in network paths or session handling. | VoIP | | Round-trip time (RTT) to UC provider | Network response time to cloud UC/UCaaS platforms | This figure helps admins detect WAN, ISP, or cloud path performance issues. | UC (primary), VoIP (cloud-based) | | RTP stream quality metrics | Quality of real-time media streams (sequence errors, jitter buffer events) | These metrics directly reflect the health of voice and video media delivery. | VoIP and UC | | QoS queue performance | Behavior of traffic prioritization queues and packet drops | QoS ensures that voice and video traffic receive proper prioritization over best-effort traffic. | VoIP and UC | | SIP response time | Time taken for signaling exchanges (e.g., INVITE to 200 OK) | This metric detects delays in call/session establishment and signaling infrastructure issues. | VoIP | | Jitter buffer discard rate | Packets dropped by the jitter buffer due to excessive delay variation | A high value indicates severe jitter and degraded real-time stream stability. | VoIP and UC | | Bandwidth utilization (per application) | Amount of bandwidth consumed by UC/VoIP traffic | High utilization helps identify congestion and capacity planning issues for voice and video workloads. | VoIP and UC | | One-way delay | Unidirectional packet delay between endpoints | This figure provides more accuracy for real-time voice quality than using RTT alone. | VoIP and UC | | Endpoint performance metrics (CPU, Wi-Fi quality) | Health and connectivity of user devices and endpoints | Poor endpoint performance can degrade call and meeting quality even if the network is healthy. | UC | While more conventional network KPIs (such as latency and packet loss) are critical for both VoIP and UC, modern UC environments also require application- and experience-level metrics (such as MOS, RTP quality, and RTT to UCaaS providers) to achieve true end-to-end visibility into real-time communication performance. ### Frequent oversights in UC monitoring A common oversight in UC monitoring is relying only on uptime and basic device status while ignoring quality-focused KPIs. With such an approach, services will appear operational even when users experience poor voice and video quality. Another frequent oversight is monitoring only the internal network and not the end-to-end path from the end user to the UCaaS provider. Since most UC platforms are cloud-based, performance degradation often occurs in the WAN or internet path. Additionally, failing to consider bidirectional performance and endpoint conditions can lead to incomplete troubleshooting.   ### Conclusion For MSPs and network administrators alike, success is no longer defined by whether services are reachable, but by whether communication remains clear, stable, and reliable. Effective UC monitoring requires an experience-driven approach, supported by the right KPIs and a strategy that reflects how services are actually delivered. ---   You may also like: [Essential steps for applying QoS on UC networks](https://info.teledynamics.com/blog/essential-steps-for-applying-qos-on-uc-networks) [How to design Wi-Fi 6 & 7 for high-density voice](https://info.teledynamics.com/blog/how-to-design-wi-fi-6-7-for-high-density-voice) [How to fix cloud UC call quality with QoS, SBCs, and SD-WAN](https://info.teledynamics.com/blog/how-to-fix-cloud-uc-call-quality-with-qos-sbcs-and-sd-wan)   Topics: [QoS](https://info.teledynamics.com/blog/topic/qos), [Troubleshooting](https://info.teledynamics.com/blog/topic/troubleshooting), [Unified Communications](https://info.teledynamics.com/blog/topic/unified-communications), [UCaaS](https://info.teledynamics.com/blog/topic/ucaas) ### Comments ## Welcome to our Think Tank In this blog you'll read our thoughts on business telephone systems. While a lot has changed in telecom since TeleDynamics was founded in 1981, we remain as committed as ever to delivering the best customer service in the industry. If you would like elaboration on a specific topic, please let us know in the comments section. 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