SIP
200 OK
The request has succeeded. For INVITE, the call has been answered. For other methods, the action has been completed successfully.
When You See This Code
When a call is answered (INVITE 200 OK), a registration succeeds (REGISTER 200 OK), or a subscription is accepted (SUBSCRIBE 200 OK).
How to Fix
No fix needed — this is a success response. The caller should send an ACK to complete the three-way handshake for INVITE transactions.