private void processRtpPacket(RtpPacket rtpPacket) {
   lastSequenceNumber = rtpPacket.getSeqNum();
   lastPacketTimestamp = rtpPacket.getTimestamp();
   AudioByteData audioData = new AudioByteData(rtpPacket.getPayload());
   if (listener != null) listener.onAudioDataReceived(audioData);
   else log.debug("No listener for incoming audio packet");
 }