SIP 199 Early Dialog Terminated vs 416 Unsupported URI Scheme
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 416 (Unsupported URI Scheme) 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, 416 means that the server cannot process the request because the URI scheme in the Request-URI is unknown to the server.
विवरण
A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
जब आप इसे देखें
In forked call scenarios when one of the forked branches is cancelled because another branch was answered.
कैसे ठीक करें
No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully.
विवरण
The server cannot process the request because the URI scheme in the Request-URI is unknown to the server.
जब आप इसे देखें
When using a URI scheme (e.g., tel:, im:, pres:) that the receiving server does not support.
कैसे ठीक करें
Use a supported URI scheme. Most SIP servers support sip: and sips: schemes. Check server capabilities with OPTIONS.
मुख्य अंतर
199 is a 1xx Provisional response, while 416 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 416: The server cannot process the request because the URI scheme in the Request-URI is unknown to the server.
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 416 when when using a URI scheme (e.g., tel:, im:, pres:) that the receiving server does not support.
कब किसका उपयोग करें
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 416 (Unsupported URI Scheme): Use a supported URI scheme. Most SIP servers support sip: and sips: schemes. Check server capabilities with OPTIONS.