SIP 202 Accepted vs 489 Bad Event
SIP 202 (Accepted) is a 2xx Success response, while 489 (Bad Event) 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, 489 means that the server did not understand the event package specified in the Event header of a SUBSCRIBE request.
설명
The request has been accepted for processing but the processing has not been completed. Used primarily for REFER requests.
이 코드를 보게 되는 경우
After sending a REFER request for call transfer. The transfer target acknowledges receipt but hasn't completed the transfer yet.
해결 방법
Wait for a NOTIFY to learn the outcome of the referred action. If no NOTIFY arrives, check subscription state and network connectivity.
설명
The server did not understand the event package specified in the Event header of a SUBSCRIBE request.
이 코드를 보게 되는 경우
When subscribing to an event package that the server does not support (e.g., dialog, presence, message-summary).
해결 방법
Check which event packages the server supports (OPTIONS request) and use a supported event package name.
주요 차이점
202 is a 2xx Success response, while 489 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 489: The server did not understand the event package specified in the Event header of a SUBSCRIBE 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 489 when when subscribing to an event package that the server does not support (e.g., dialog, presence, message-summary).
언제 어떤 것을 사용할지
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 489 (Bad Event): Check which event packages the server supports (OPTIONS request) and use a supported event package name.