SIP 199 Early Dialog Terminated vs 603 Decline
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 603 (Decline) 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, 603 means that the callee's machine was contacted successfully but the user explicitly does not wish to or cannot participate. Unlike 600, this may be because the callee doesn't want to communicate, not necessarily
描述
A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
何时出现
In forked call scenarios when one of the forked branches is cancelled because another branch was answered.
如何修复
No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully.
描述
The callee's machine was contacted successfully but the user explicitly does not wish to or cannot participate. Unlike 600, this may be because the callee doesn't want to communicate, not necessarily because they're busy.
何时出现
When the callee explicitly declines the call. This is an active rejection, not a busy or unavailable state.
如何修复
The callee has declined. Respect their decision. Consider alternative communication methods (email, messaging).
主要区别
199 is a 1xx Provisional response, while 603 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 603: The callee's machine was contacted successfully but the user explicitly does not wish to or cannot participate. Unlike 600, this may be because the callee doesn't want to communicate, not necessarily
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 603 when when the callee explicitly declines the call. This is an active rejection, not a busy or unavailable state.
何时使用哪个
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 603 (Decline): The callee has declined. Respect their decision. Consider alternative communication methods (email, messaging).