SIP 204 No Notification vs 428 Use Identity Header
SIP 204 (No Notification) is a 2xx Success response, while 428 (Use Identity Header) 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, 428 means that the server requires an Identity header to verify the caller's identity but it was not included in the request.
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 server requires an Identity header to verify the caller's identity but it was not included in the request.
Quand vous le voyez
In environments that enforce SIP Identity (RFC 4474) for caller authentication and spam prevention (STIR/SHAKEN).
Comment résoudre
Add a valid Identity header signed by an authentication service. Ensure your STIR/SHAKEN infrastructure is properly configured.
Différences clés
204 is a 2xx Success response, while 428 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 428: The server requires an Identity header to verify the caller's identity but it was not included in 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 428 when in environments that enforce SIP Identity (RFC 4474) for caller authentication and spam prevention (STIR/SHAKEN).
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 428 (Use Identity Header): Add a valid Identity header signed by an authentication service. Ensure your STIR/SHAKEN infrastructure is properly configured.