HTTP 200 OK vs SIP 200 OK
HTTP and SIP both use 200 OK to signal success, but the implications are very different. In HTTP, 200 OK completes a request-response cycle. In SIP, 200 OK to an INVITE establishes a media session (phone call) and requires an ACK to complete the three-way handshake.
คำอธิบาย
The request succeeded. The meaning depends on the HTTP method: GET returns the resource, POST reports the action result, HEAD returns headers only.
เมื่อคุณพบเห็น
The most common HTTP response — indicates the request was processed successfully.
วิธีแก้ไข
No fix needed. The request succeeded as expected.
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.
ความแตกต่างหลัก
HTTP 200 completes the transaction — the response body contains the requested data.
SIP 200 to an INVITE starts a dialog (call session) that requires an ACK from the caller to finalize.
SIP 200 includes SDP (Session Description Protocol) body describing the media session (codecs, ports, IPs).
HTTP 200 is stateless per request; SIP 200 creates stateful dialog state that persists for the call duration.
SIP 200 to REGISTER confirms registration; SIP 200 to BYE confirms call termination — context matters.
ควรใช้อันไหนเมื่อไร
In HTTP, return 200 for any successful request that includes a response body. In SIP, a UAS sends 200 OK to accept an INVITE (answer the call), confirm a REGISTER, or acknowledge a BYE. The caller must ACK a 200 to INVITE within 64*T1 seconds or the session is torn down.