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To recover lost RTP packets, the client selects the retransmission stream by sending the SETUP request (section 2.2.7.10.1) to the server. In the SETUP request (section 2.2.7.10.1), the client specifies the RTP port to receive retransmitted RTP packets. In the response to this request, the server specifies the RTCP port to send the generic NACK messages. For example, the following SETUP request (section 2.2.7.10.1) specifies an RTP port of 4958.
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SETUP rtsp://server/sample/rtx RTSP/1.0 Transport: RTP/AVP/UDP;unicast;client_port=4958-4959;ssrc=b58db0de ;mode=PLAY