code: public boolean isAvailable() {
  		// The channel is available is is connected
  		boolean available = this.rtpChannel != null && this.rtpChannel.isConnected();
  		// In case of WebRTC calls the DTLS handshake must be completed
  		if(this.isWebRtc) {
  			available = available && this.webRtcHandler.isHandshakeComplete();
  		}
  		return available;
  	}
docs: Checks whether the data channel is available for media exchange.
  
  @return