SIP 181 Call Is Being Forwarded vs 436 Bad Identity-Info
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 436 (Bad Identity-Info) 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, 436 means that the Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
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 Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
このコードが表示される場合
When the Identity-Info URI in the request points to an unreachable or invalid certificate location.
解決方法
Ensure the Identity-Info URI is reachable and points to a valid certificate. Check DNS resolution and TLS configuration.
主な違い
181 is a 1xx Provisional response, while 436 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 436: The Identity-Info header contains a URI that the server cannot dereference to obtain the signing certificate.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 436 when when the Identity-Info URI in the request points to an unreachable or invalid certificate location.
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 436 (Bad Identity-Info): Ensure the Identity-Info URI is reachable and points to a valid certificate. Check DNS resolution and TLS configuration.