SIP 199 Early Dialog Terminated vs 600 Busy Everywhere
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 600 (Busy Everywhere) is a 6xx Global 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, 600 means that the callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
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 callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
Khi bạn thấy mã này
When the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
Cách khắc phục
Wait and try again later. No alternative contact points exist. The callee must become available on their own.
Sự khác biệt chính
199 is a 1xx Provisional response, while 600 is a 6xx Global 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 600: The callee's end system was contacted successfully but the callee is busy and does not wish to take the call at this time. Unlike 486 (Busy Here), this is a definitive response.
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 600 when when the callee has rejected the call on all devices. No other endpoints should be tried. The user is universally busy.
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 600 (Busy Everywhere): Wait and try again later. No alternative contact points exist. The callee must become available on their own.