SIP 404 Not Found
Short definition
SIP 404 Not Found is a SIP response indicating that the requested destination or resource was not found by the responding server.
Meaning and how it works
This response may occur when the server cannot match a requested SIP URI to an address or routing entry. It describes the result of a specific request, not necessarily the health of the whole network. The responding node is important when diagnosing the cause.
Business applications
- Business scenario:
A technician sees SIP 404 when calling an extension and reviews the dial plan, addressed domain and destination registration.
What to check before implementation
Identify which server generated the response before changing routing rules. An incorrect URI and a missing dial-plan entry can produce similar symptoms.