SIP 302 Moved Temporarily vs 433 Anonymity Disallowed
SIP 302 (Moved Temporarily) is a 3xx Redirection response, while 433 (Anonymity Disallowed) is a 4xx Client Failure response. 302 indicates that the callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests. In contrast, 433 means that the request has been rejected because the server policy requires caller identification and the request was anonymous.
Description
The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
When You See It
When a user is temporarily reachable at a different location, such as when traveling or using a different device.
How to Fix
Redirect the current call to the Contact URI provided, but keep the original URI for future requests.
Description
The request has been rejected because the server policy requires caller identification and the request was anonymous.
When You See It
When calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
How to Fix
Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.
Key Differences
302 is a 3xx Redirection response, while 433 is a 4xx Client Failure response.
SIP 302: The callee has temporarily moved to a different address. The client should retry the request at the Contact address but continue using the original URI for future requests.
SIP 433: The request has been rejected because the server policy requires caller identification and the request was anonymous.
You encounter 302 when when a user is temporarily reachable at a different location, such as when traveling or using a different device.
You encounter 433 when when calling with caller ID suppressed (anonymous) to a server or destination that requires caller identification.
When to Use Which
For 302 (Moved Temporarily): Redirect the current call to the Contact URI provided, but keep the original URI for future requests. For 433 (Anonymity Disallowed): Remove the Privacy header or include proper caller identification. Some networks require valid From header identity.