Yet behind the green lights of monitoring dashboards and healthy server metrics lies a troubling reality: enterprise communications infrastructure regularly fails customers in ways that traditional observability simply cannot detect.
That's because these issues often aren't widespread system failures, but problems affecting individual customer experiences. For instance, if an IVR is not registering a customer's input, preventing proper routing, this can go undetected for quite some time. Yet, such situations can have disastrous effects.
A Zendesk 2025 study found that more than half of consumers will switch to a competitor after only one bad experience.
Sam Melvin, Co-Founder of Voxology, frames the urgency: "If you care about your customer experience over digital channels, the idea that you don't have end-to-end cx testing is crazy."
HeartBeat, an extension of Voxology's cx testing suite, which includes StressTest, is a system that detects problems which internal monitoring misses. To understand why this goes beyond traditional observability, it's important to examine the fundamental limitations of current communications monitoring.
Understanding the Customer Experience Gap in Communications Monitoring
Traditional observability systems are often the backbone of company monitoring strategies. However, Melvin believes misconceptions around their capabilities, coupled with migration to the cloud, have created false security.
"One myth is that moving to the cloud means you won't have scaling issues. The second is that traditional observability tools are all you need," Melvin says.
These systems’ monitoring is limited to internal metrics rather than simulating real user interactions. They rely on telemetry data—server logs, performance counters, network statistics—to assess system status, observing how components function individually but not generating synthetic transactions that mimic actual customer journeys.
They lack the visibility to place calls outside their network, navigate into calls outside their network. This then stops them from navigating IVR menus, verifying audio quality, or confirming that touch-tone inputs and speech recognition work as intended.
Without external, end-to-end tests traversing the entire customer path—from dialing to completing the call flow—these systems miss degradations that only manifest in real user scenarios. Critical customer-facing issues like unexpected hang-ups, misrouted calls, faulty IVR prompts, or regional carrier problems can go entirely unnoticed despite healthy internal metrics.
"Many organizations assume that if their systems show as healthy, customers are having a good experience," Melvin said. "Without testing from the outside in, you miss critical failures that only appear in real user interactions. That gap can create churn and lost revenue before anyone knows there's a problem."
Traditional observability would eventually show drop-off rates on a widespread issue. By then, you could have thousands of unhappy customers, and employees.
This monitoring gap becomes particularly problematic during low-traffic periods or following infrastructure changes. During off-hours, when volume is minimal, traditional monitoring may miss problems that will eventually impact customers when business resumes. After system updates, internal metrics may indicate successful deployment while customer-facing functionality degrades undetectably.
