SIP 200 OK vs 487 Request Terminated
SIP 200 (OK) is a 2xx Success response, while 487 (Request Terminated) is a 4xx Client Failure response. 200 indicates that the request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully. 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 request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
何时出现
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
如何修复
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
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
200 is a 2xx Success response, while 487 is a 4xx Client Failure response.
SIP 200: The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
SIP 487: The request was terminated by a BYE or CANCEL. The original request was cancelled before it could be completed.
You encounter 200 when when a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
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 200 (OK): No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions. For 487 (Request Terminated): No fix needed — the caller intentionally terminated the request. This is normal behavior.