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Knowledge Base & Operational DocumentationHow to Troubleshoot a VoIP Call That Rings but Has No Audio After Answering
11/10/2026
Call signaling may succeed while voice media fails because of NAT, firewall rules, codec mismatch, or an endpoint issue. Ringing alone does not confirm a working media path.
What to check
Compare internal and external calls, test another device and network, capture the time and direction, and review recent firewall or router changes. Check whether audio fails one or both ways.
Recommended next step
Isolate the media path and change one verified setting at a time. Informatix Systems can diagnose VoIP network and call quality problems.