SIP 204 No Notification vs 380 Alternative Service
SIP 204 (No Notification) is a 2xx Success response, while 380 (Alternative Service) is a 3xx Redirection response. 204 indicates that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request. In contrast, 380 means that the call was not successful but alternative services are possible. The response body contains a description of alternative services.
説明
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
このコードが表示される場合
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
解決方法
No fix needed. The subscription was accepted but there is no state change to notify about yet.
説明
The call was not successful but alternative services are possible. The response body contains a description of alternative services.
このコードが表示される場合
Rarely seen in practice. Indicates that the request cannot be fulfilled as-is but the user may be reached via an alternative method.
解決方法
Check the response body for alternative service descriptions and attempt to reach the user through those channels.
主な違い
204 is a 2xx Success response, while 380 is a 3xx Redirection response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 380: The call was not successful but alternative services are possible. The response body contains a description of alternative services.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 380 when rarely seen in practice. Indicates that the request cannot be fulfilled as-is but the user may be reached via an alternative method.
どちらをいつ使うか
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 380 (Alternative Service): Check the response body for alternative service descriptions and attempt to reach the user through those channels.