SIP 302 Moved Temporarily vs 487 Request Terminated
SIP 302 (Moved Temporarily) is a 3xx Redirection response, while 487 (Request Terminated) 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, 487 means that the request was terminated by a BYE or CANCEL. The original request was cancelled before it could be completed.
描述
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.
何时出现
When a user is temporarily reachable at a different location, such as when traveling or using a different device.
如何修复
Redirect the current call to the Contact URI provided, but keep the original URI for future requests.
描述
The request was terminated by a BYE or CANCEL. The original request was cancelled before it could be completed.
何时出现
When the caller hangs up before the callee answers (CANCEL sent for pending INVITE). This is normal call abandonment.
如何修复
No fix needed — the caller intentionally terminated the request. This is normal behavior.
主要区别
302 is a 3xx Redirection response, while 487 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 487: The request was terminated by a BYE or CANCEL. The original request was cancelled before it could be completed.
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 487 when when the caller hangs up before the callee answers (CANCEL sent for pending INVITE). This is normal call abandonment.
何时使用哪个
For 302 (Moved Temporarily): Redirect the current call to the Contact URI provided, but keep the original URI for future requests. For 487 (Request Terminated): No fix needed — the caller intentionally terminated the request. This is normal behavior.