SIP 181 Call Is Being Forwarded vs 433 Anonymity Disallowed
SIP 181 (Call Is Being Forwarded) is a 1xx Provisional response, while 433 (Anonymity Disallowed) 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, 433 means that the request has been rejected because the server policy requires caller identification and the request was anonymous.
Mô tả
A proxy server may send this to indicate that the call is being forwarded to a different set of destinations.
Khi bạn thấy mã này
When the callee has call forwarding enabled and the request is being redirected to another number or device.
Cách khắc phục
No action needed. The call is being redirected. If forwarding is unintended, the callee should update their forwarding settings.
Mô tả
The request has been rejected because the server policy requires caller identification and the request was anonymous.
Khi bạn thấy mã này
When calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
Cách khắc phục
Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.
Sự khác biệt chính
181 is a 1xx Provisional response, while 433 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 433: The request has been rejected because the server policy requires caller identification and the request was anonymous.
You encounter 181 when when the callee has call forwarding enabled and the request is being redirected to another number or device.
You encounter 433 when when calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
Khi nào dùng cái nào
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 433 (Anonymity Disallowed): Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.