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> Chapter 34 - VoIP Solutions: SIP > SIP messages and media protocols > SIP message start line

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 (, and the SIP version:

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 (200) and the reason phrase (OK).

SIP/2.0 200 OK