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.
विवरण
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
जब आप इसे देखें
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
कैसे ठीक करें
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
विवरण
The request could not be understood due to malformed syntax. The client should not repeat the request without modifications.
जब आप इसे देखें
When the SIP message has syntax errors, missing required headers, or invalid header values.
कैसे ठीक करें
Review the SIP message for syntax errors. Check required headers (To, From, Call-ID, CSeq, Via, Max-Forwards) and ensure proper formatting.
मुख्य अंतर
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.
कब किसका उपयोग करें
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.