SIP 202 Accepted vs 412 Conditional Request Failed
SIP 202 (Accepted) is a 2xx Success response, while 412 (Conditional Request Failed) 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, 412 means that the precondition given in the request was not met. Used with SIP event state publication (RFC 3903).
Açıklama
The request has been accepted for processing but the processing has not been completed. Used primarily for REFER requests.
Gördüğünüzde
After sending a REFER request for call transfer. The transfer target acknowledges receipt but hasn't completed the transfer yet.
Nasıl Düzeltilir
Wait for a NOTIFY to learn the outcome of the referred action. If no NOTIFY arrives, check subscription state and network connectivity.
Açıklama
The precondition given in the request was not met. Used with SIP event state publication (RFC 3903).
Gördüğünüzde
When a PUBLISH request includes an If-Match header with an entity tag that does not match the current state on the server.
Nasıl Düzeltilir
Refresh the entity tag by performing a new PUBLISH without If-Match, then use the returned SIP-ETag for subsequent updates.
Temel Farklar
202 is a 2xx Success response, while 412 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 412: The precondition given in the request was not met. Used with SIP event state publication (RFC 3903).
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 412 when when a PUBLISH request includes an If-Match header with an entity tag that does not match the current state on the server.
Hangisini Ne Zaman Kullanmalı
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 412 (Conditional Request Failed): Refresh the entity tag by performing a new PUBLISH without If-Match, then use the returned SIP-ETag for subsequent updates.