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Knowledge Base & Operational DocumentationHow to Troubleshoot VoIP Calls That Fail During an Internet Congestion Event
11/10/2026
Congestion can increase latency, jitter, and packet loss even while basic internet browsing continues to work.
Checks to make
Collect call quality metrics and timestamps, compare voice with other traffic, inspect uplink utilization and queue behavior, and test a wired call. Verify that QoS is preserved across the full path rather than only at the phone.
When to get help
Voice and network support can identify congestion and traffic treatment. Informatix Systems can assess the symptoms, evidence, and next steps. Contact Informatix Systems to discuss this issue.