code: public void enableDTLS() {
          if (!this.dtls) {
              this.rtpChannel.enableSRTP();
              if (!this.rtcpMux) {
                  rtcpChannel.enableSRTCP();
              }
              this.dtls = true;
  
              if (logger.isDebugEnabled()) {
                  logger.debug(this.mediaType + " channel " + this.ssrc + " enabled DTLS");
              }
          }
      }
docs: Enables DTLS on the channel. RTP and RTCP packets flowing through this channel will be secured.
  
  <p>
  This method is used in <b>outbound</b> calls where the remote fingerprint is NOT known.<br>
  Once the remote peer replies via SDP, the remote fingerprint must be set.
  </p>
  
  @throws IllegalStateException Cannot be invoked when DTLS is already enabled