title: AAC SDP Payload for receive only stream
body: <p>I want to create a sdp for receiving a AAC stream.. I will not be sending out any stream
  Consider the following payload:</p>
  
  <blockquote>
    <p>m=audio 50002 RTP/AVP 97</p>
    
    <p>a=rtpmap:97 mpeg4-generic/16000/1</p>
    
    <p>a=fmtp:97 streamtype=5; profile-level-id=15; mode=AAC-hbr;
    config=1408; sizeLength=13; indexLength=3; indexDeltaLength=3;
    profile=1; bitrate=64000;</p>
  </blockquote>
  
  <p>The fmtp parameters would only depend on the sender because this is a receive only stream. I do not know the values of the config/bitrate and other parameters of the sender.
  So what should be the correct values of this parameters for the request?</p>