SIP 200 OK vs 422 Session Interval Too Small
SIP 200 (OK) is a 2xx Success response, while 422 (Session Interval Too Small) 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, 422 means that the request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
คำอธิบาย
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
เมื่อคุณพบเห็น
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
วิธีแก้ไข
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.
คำอธิบาย
The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
เมื่อคุณพบเห็น
When using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
วิธีแก้ไข
Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.
ความแตกต่างหลัก
200 is a 2xx Success response, while 422 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 422: The request's Session-Expires value is too small. The Min-SE header in the response indicates the minimum acceptable session interval.
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 422 when when using SIP session timers (RFC 4028) and the proposed session refresh interval is below the server's minimum.
ควรใช้อันไหนเมื่อไร
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 422 (Session Interval Too Small): Increase the Session-Expires value to at least the value indicated in the Min-SE header of the 422 response.