SIP 199 Early Dialog Terminated vs 300 Multiple Choices
SIP 199 (Early Dialog Terminated) is a 1xx Provisional response, while 300 (Multiple Choices) is a 3xx Redirection 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, 300 means that the address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
Описание
A UAS can send this to indicate that an early dialog has been terminated. Used when forking results in multiple early dialogs.
Когда вы это видите
In forked call scenarios when one of the forked branches is cancelled because another branch was answered.
Как исправить
No action needed. This is normal behavior in forked call setups. Ensure your UA handles early dialog termination gracefully.
Описание
The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
Когда вы это видите
When a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
Как исправить
Select one of the provided Contact addresses and resend the request to that specific URI.
Ключевые различия
199 is a 1xx Provisional response, while 300 is a 3xx Redirection 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 300: The address in the request resolved to several choices, each with its own location. The user or UA can select a preferred communication endpoint.
You encounter 199 when in forked call scenarios when one of the forked branches is cancelled because another branch was answered.
You encounter 300 when when a user has multiple registered devices or contact addresses and the server cannot determine which one to use.
Когда что использовать
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 300 (Multiple Choices): Select one of the provided Contact addresses and resend the request to that specific URI.