SIP 200 OK vs 400 Bad Request
SIP 200 (OK) is a 2xx Success response, while 400 (Bad Request) 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, 400 means that the request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
الوصف
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
متى تراه
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
كيفية الإصلاح
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
الوصف
The request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
متى تراه
When the SIP message has syntax errors, missing required headers, or invalid header values.
كيفية الإصلاح
Review the SIP message for syntax errors. Check required headers (To, From, Call-ID, CSeq, Via, Max-Forwards) and ensure proper formatting.
الفروق الرئيسية
200 is a 2xx Success response, while 400 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 400: The request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
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 400 when when the SIP message has syntax errors, missing required headers, or invalid header values.
متى تستخدم أيًا منهما
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 400 (Bad Request): Review the SIP message for syntax errors. Check required headers (To, From, Call-ID, CSeq, Via, Max-Forwards) and ensure proper formatting.