SIP 100 Trying vs 433 Anonymity Disallowed
SIP 100 (Trying) is a 1xx Provisional response, while 433 (Anonymity Disallowed) is a 4xx Client Failure response. 100 indicates that the request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses. In contrast, 433 means that the request has been rejected because the server policy requires caller identification and the request was anonymous.
Mô tả
The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
Khi bạn thấy mã này
Immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
Cách khắc phục
No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration.
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
100 is a 1xx Provisional response, while 433 is a 4xx Client Failure response.
SIP 100: The request has been received by the next-hop server and an unspecified action is being taken to process it. The UAC should expect additional responses.
SIP 433: The request has been rejected because the server policy requires caller identification and the request was anonymous.
You encounter 100 when immediately after sending an INVITE. The proxy has received the call and is searching for the callee. This is the SIP equivalent of a dial tone.
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 100 (Trying): No fix needed — this is normal call setup behavior. If stuck on 100 Trying for too long, check network connectivity and proxy configuration. For 433 (Anonymity Disallowed): Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.