SIP 204 No Notification vs 423 Interval Too Brief
SIP 204 (No Notification) is a 2xx Success response, while 423 (Interval Too Brief) 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, 423 means that the expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
Description
The request was successful but the server has decided not to send a NOTIFY for this SUBSCRIBE request.
Quand vous le voyez
When subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
Comment résoudre
No fix needed. The subscription was accepted but there is no state change to notify about yet.
Description
The expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
Quand vous le voyez
When a REGISTER or SUBSCRIBE request has an Expires value that is below the server's minimum. Common with aggressive keep-alive timers.
Comment résoudre
Increase the Expires header value to at least the Min-Expires value from the response.
Différences clés
204 is a 2xx Success response, while 423 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 423: The expiration time in the request is too short. The response contains a Min-Expires header indicating the minimum allowed value.
You encounter 204 when when subscribing to event packages that may not generate immediate notifications, such as dialog or presence packages.
You encounter 423 when when a REGISTER or SUBSCRIBE request has an Expires value that is below the server's minimum. Common with aggressive keep-alive timers.
Quand utiliser lequel
For 204 (No Notification): No fix needed. The subscription was accepted but there is no state change to notify about yet. For 423 (Interval Too Brief): Increase the Expires header value to at least the Min-Expires value from the response.