+----------------+
                |        [0..3] -+--> forward to STUN
                |                |
                |       [4..15] -+--> DROP
                |                |
                |      [16..19] -+--> forward to ZRTP
                |                |
    packet -->  |      [20..63] -+--> forward to DTLS
                |                |
                |      [64..79] -+--> forward to TURN Channel
                |                | (if from TURN server), else QUIC
                |     [80..127] -+--> forward to QUIC
                |                |
                |    [128..191] -+--> forward to RTP/RTCP
                |                |
                |    [192..255] -+--> forward to QUIC
                +----------------+

     Figure 3: The receiver's packet demultiplexing algorithm.