SIP 204 No Notification vs 408 Request Timeout
SIP 204 (No Notification) is a 2xx Success response, while 408 (Request Timeout) is a 4xx Client 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, 408 means that the server could not produce a response within a suitable time. The client may repeat the request without modifications at any later time.
Описание
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
Когда вы это видите
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
Как исправить
No fix needed. The subscription was accepted but there is no state change to notify about yet.
Описание
The server could not produce a response within a suitable time. The client may repeat the request without modifications at any later time.
Когда вы это видите
When the callee does not respond within the configured timeout (e.g., phone rings but is never answered, or the endpoint is unreachable).
Как исправить
Check if the callee's device is powered on and registered. Verify network connectivity. Consider adjusting the server's transaction timeout value.
Ключевые различия
204 is a 2xx Success response, while 408 is a 4xx Client Failure response.
SIP 204: The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
SIP 408: The server could not produce a response within a suitable time. The client may repeat the request without modifications at any later time.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 408 when when the callee does not respond within the configured timeout (e.g., phone rings but is never answered, or the endpoint is unreachable).
Когда что использовать
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 408 (Request Timeout): Check if the callee's device is powered on and registered. Verify network connectivity. Consider adjusting the server's transaction timeout value.