2.2.3.4 Transport

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The Transport header is defined for use in responses sent to a client. The syntax of the Transport header is as defined in section 12.39 of [RFC2326], with the extensions defined by the DLNA Guidelines (see [DLNA] guideline 7.4.241). The Microsoft Extensions define one extra parameter that can be added to the Transport header. The parameter is called rtcp-fb-ssrc and specifies the value of the RTP SSRC field (see [RFC3550] section 5.1) in RTP packets that are retransmitted using the RTP Retransmission Payload Format, defined in [RFC4588].

The syntax of the Transport header is defined as follows.

  
 Transport = "Transport: "
      transport-spec ; defined in [RFC2326] section 12.39
      [ ";rtcp-fb-ssrc=" 8HEXDIG ]
     *parameter ; defined in [RFC2326] section 12.39