3.1.4.2 Request to start streaming using RTSP
This event occurs when a higher layer requests to start streaming from a server using RTSP.
The client MUST set the value of the State variable to READY.
As part of the standard operation of the RTSP protocol, the client will send a DESCRIBE request to the server. The client MUST adhere to the rules referenced by [DLNA] guideline 7.4.210 that apply to DESCRIBE requests. In addition, the request SHOULD include the Supported header, as defined in section 2.2.3.3.1. The request SHOULD include the X-Accept-Authentication header, as defined in section 2.2.3.6.
The DESCRIBE request SHOULD include the User-Agent header defined in [RFC2326] section 12.41, or MAY include the User-Agent header defined in section 2.2.3.5.<1>
Processing for the RTSP DESCRIBE response is specified in section 3.1.5.2.