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If RTP Info is missing and it is not a receiver only, eg. audio backchannel. Then return GST_RTSP_STS_INTERNAL_SERVER_ERROR. In rfc2326 it says RTP-info is req. but in RFC7826 it is conditional. Since 1.14 there is audio backchannel support. Thus RTP-info is conditional now. When audio backchannel only mode, there is no RTP-info. Fixes #82
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