SIP 199 Early Dialog Terminated vs 422 Session Interval Too Small
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 422 (Session Interval Too Small) 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, 422 means that the request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
Mô tả
A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
Khi bạn thấy mã này
In forked call scenarios when one of the forked branches is cancelled because another branch was answered.
Cách khắc phục
No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully.
Mô tả
The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
Khi bạn thấy mã này
When using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
Cách khắc phục
Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.
Sự khác biệt chính
199 is a 1xx Provisional response, while 422 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 422: The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 422 when when using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
Khi nào dùng cái nào
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 422 (Session Interval Too Small): Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.