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Knowledge Base & Operational DocumentationWhy Does a VoIP Call Have No Audio After a Call Is Answered?
A call can connect and ring normally while audio fails because of blocked media ports, NAT traversal, device selection, VPN, or asymmetric network paths. Signaling success alone does not confirm that voice traffic flows.
What to check
Compare one-way and two-way behavior, endpoint and network, call path, media address negotiation, firewall logs, and VPN state. Test a controlled internal and external call and identify whether the problem follows one device.
Recommended next step
Correct the media path using the provider’s documented requirements and confirm audio in both directions. Avoid opening unrestricted port ranges without understanding security and service needs.
How Informatix Systems can help
Informatix Systems provides VoIP and network communications services. We can assess the affected workflow, trace the likely failure point, and help plan a practical resolution. Contact us with the system involved, when the issue began, and non-sensitive error details.