SIP 202 Accepted vs 485 Ambiguous
SIP 202 (Accepted) is a 2xx Success response, while 485 (Ambiguous) 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, 485 means that the Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
説明
The request has been accepted for processing but the processing has not been completed. Used primarily for REFER requests.
このコードが表示される場合
After sending a REFER request for call transfer. The transfer target acknowledges receipt but hasn't completed the transfer yet.
解決方法
Wait for a NOTIFY to learn the outcome of the referred action. If no NOTIFY arrives, check subscription state and network connectivity.
説明
The Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
このコードが表示される場合
When the destination address matches multiple users and the server cannot determine which one is intended.
解決方法
Use a more specific SIP URI. Check the response body for a list of possible matches and select the correct one.
主な違い
202 is a 2xx Success response, while 485 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 485: The Request-URI was ambiguous. The response body may contain a list of possible unambiguous addresses.
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 485 when when the destination address matches multiple users and the server cannot determine which one is intended.
どちらをいつ使うか
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 485 (Ambiguous): Use a more specific SIP URI. Check the response body for a list of possible matches and select the correct one.