SIP 199 Early Dialog Terminated vs 430 Flow Failed
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 430 (Flow Failed) is a 4xx Client Failure response. 199 indicates that a UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs. In contrast, 430 means that the specific flow to a user agent has failed but other flows may succeed. Used with SIP outbound (RFC 5626).
Description
A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
Quand vous le voyez
In forked call scenarios when one of the forked branches is cancelled because another branch was answered.
Comment résoudre
No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully.
Description
The specific flow to a user agent has failed but other flows may succeed. Used with SIP outbound (RFC 5626).
Quand vous le voyez
When using SIP outbound connections and the specific TCP/TLS connection (flow) to the UA has been lost.
Comment résoudre
The proxy should attempt delivery via other registered flows. The UA should re-register to establish a new flow.
Différences clés
199 is a 1xx Provisional response, while 430 is a 4xx Client Failure response.
SIP 199: A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
SIP 430: The specific flow to a user agent has failed but other flows may succeed. Used with SIP outbound (RFC 5626).
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 430 when when using SIP outbound connections and the specific TCP/TLS connection (flow) to the UA has been lost.
Quand utiliser lequel
For 199 (Early Dialog Terminated): No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully. For 430 (Flow Failed): The proxy should attempt delivery via other registered flows. The UA should re-register to establish a new flow.