public void stop() {
		if (t != null) {
			try {
				is.close();
			} catch (IOException ignore) {}
			t.interrupt();
			try {
				t.join();
			} catch (InterruptedException e) {}
			t = null;
		}
	}
RFC 3267.
  
  AMR Streaming over RTP.
  
  Must be fed with an InputStream containing raw AMR NB
  Stream must begin with a 6 bytes long header: "#!AMR\n", it will be skipped
src/net/majorkernelpanic/streaming/rtp/AMRNBPacketizer.java