SIP message start line
The first line in a SIP message is called the start line. The start line in a request message is called the request-line and the start line in a response message is called the status-line.
|Request-line||The first line of a SIP request message. The request-line includes the SIP message type, the SIP protocol version, and a Request URI that indicates the user or service to which this request is being addressed. The following example request-line specifies the INVITE message type, the address of the sender of the message (
|Status-line||The first line of a SIP response message. The status-line includes the SIP protocol version, the response code, and the reason phrase. The example status-line includes the SIP version, the response code (