SIP 181 Call Is Being Forwarded vs 405 Method Not Allowed
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 405 (Method Not Allowed) is a 4xx Client Failure response. 181 indicates that a proxy server may send this to indicate that the call is being forwarded to a different set of destinations. In contrast, 405 means that the method specified in the Request-Line is not allowed for the address identified by the Request-URI.
説明
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
このコードが表示される場合
When the callee has call forwarding enabled and the request is being redirected to another number or device.
解決方法
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
説明
The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
このコードが表示される場合
When sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
解決方法
Check the Allow header in the response to see which methods are supported. Use a supported method instead.
主な違い
181 is a 1xx Provisional response, while 405 is a 4xx Client Failure response.
SIP 181: A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
SIP 405: The method specified in the Request-Line is not allowed for the address identified by the Request-URI.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 405 when when sending a SIP method (e.g., MESSAGE, PUBLISH) that the server does not support for the target URI.
どちらをいつ使うか
For 181 (Call Is Being Forwarded): No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings. For 405 (Method Not Allowed): Check the Allow header in the response to see which methods are supported. Use a supported method instead.