SIP 204 No Notification vs 500 Server Internal Error
SIP 204 (No Notification) is a 2xx Success response, while 500 (Server Internal Error) is a 5xx Server Failure response. 204 indicates that the request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request. In contrast, 500 means that the server encountered an unexpected condition that prevented it from fulfilling the request.
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 server encountered an unexpected condition that prevented it from fulfilling the request.
このコードが表示される場合
When the SIP server has an internal error — database failure, unhandled exception, or resource exhaustion.
解決方法
Check server logs for the specific error. Common causes include database connectivity issues, configuration errors, or memory exhaustion.
主な違い
204 is a 2xx Success response, while 500 is a 5xx Server Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 500: The server encountered an unexpected condition that prevented it from fulfilling the request.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 500 when when the SIP server has an internal error — database failure, unhandled exception, or resource exhaustion.
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 500 (Server Internal Error): Check server logs for the specific error. Common causes include database connectivity issues, configuration errors, or memory exhaustion.