SIP 200 OK vs 404 Not Found
SIP 200 (OK) is a 2xx Success response, while 404 (Not Found) 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, 404 means that the user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
説明
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
このコードが表示される場合
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
解決方法
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
説明
The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
このコードが表示される場合
When calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
解決方法
Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.
主な違い
200 is a 2xx Success response, while 404 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 404: The user specified in the Request-URI does not exist at the domain. The server has authoritative information that the user does not exist.
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 404 when when calling a number or SIP address that does not exist on the server. Different from 480 (user exists but is temporarily unavailable).
どちらをいつ使うか
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 404 (Not Found): Verify the SIP URI or phone number. Check if the user is registered on the correct domain. Ensure the domain is correct.