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The res_pjsip_sdp_rtp module will need to place the nack rtcp-fb attributes into the SDP if enabled.

The res_pjsip_sdp_rtp module will need to place rtx into the SDP if configured on the RTP instance. This can use the existing codec method that is also used for telephone-event.

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  1. Received goog-remb AST_FRAME_RTCP frames from each receiver of a stream are stored with the sending stream
  2. Periodically all stored goog-remb AST_FRAME_RTCP frames are iterated and a combined goog-remb AST_FRAME_RTCP frame is created (behavior tbd - we will need to experiment and determine what percentage of reports to discard)
  3. All stored goog-remb AST_FRAME_RTCP frames are discarded
  4. The combined goog-remb AST_FRAME_RTCP frame is written to the sending stream

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