SIP 202 Accepted vs 428 Use Identity Header
SIP 202 (Accepted) is a 2xx Success response, while 428 (Use Identity Header) is a 4xx Client Failure response. 202 indicates that the request has been accepted for processing but the processing has not been completed. Used primarily for REFER requests. 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 has been accepted for processing but the processing has not been completed. Used primarily for REFER requests.
Quand vous le voyez
After sending a REFER request for call transfer. The transfer target acknowledges receipt but hasn't completed the transfer yet.
Comment résoudre
Wait for a NOTIFY to learn the outcome of the referred action. If no NOTIFY arrives, check subscription state and network connectivity.
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
202 is a 2xx Success response, while 428 is a 4xx Client Failure response.
SIP 202: The request has been accepted for processing but the processing has not been completed. Used primarily for REFER requests.
SIP 428: The server requires an Identity header to verify the caller's identity but it was not included in the request.
You encounter 202 when after sending a REFER request for call transfer. The transfer target acknowledges receipt but hasn't completed the transfer yet.
You encounter 428 when in environments that enforce SIP Identity (RFC 4474) for caller authentication and spam prevention (STIR/SHAKEN).
Quand utiliser lequel
For 202 (Accepted): Wait for a NOTIFY to learn the outcome of the referred action. If no NOTIFY arrives, check subscription state and network connectivity. For 428 (Use Identity Header): Add a valid Identity header signed by an authentication service. Ensure your STIR/SHAKEN infrastructure is properly configured.