SIP 180 Ringing vs 433 Anonymity Disallowed
SIP 180 (Ringing) is a 1xx Provisional response, while 433 (Anonymity Disallowed) is a 4xx Client Failure response. 180 indicates that the UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end. In contrast, 433 means that the request has been rejected because the server policy requires caller identification and the request was anonymous.
説明
The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
このコードが表示される場合
During call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
解決方法
No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings.
説明
The request has been rejected because the server policy requires caller identification and the request was anonymous.
このコードが表示される場合
When calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
解決方法
Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.
主な違い
180 is a 1xx Provisional response, while 433 is a 4xx Client Failure response.
SIP 180: The UA receiving the INVITE is trying to alert the user. This response is used to initiate local ringback tone at the caller's end.
SIP 433: The request has been rejected because the server policy requires caller identification and the request was anonymous.
You encounter 180 when during call setup when the callee's phone is ringing. You should hear a ringback tone after receiving this response.
You encounter 433 when when calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
どちらをいつ使うか
For 180 (Ringing): No fix needed — the callee's device is ringing. If the call never connects after ringing, check the callee's device or call forwarding settings. For 433 (Anonymity Disallowed): Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.