Closes #42 - ltr standard call state was not accurately tracking call

state. 

Note: a related issue described in ticket #42 involves issues with the
audio output module.  A new ticket will be opened with that issue.

src/module/decode/ltrstandard/message/UnknownMessage.java

@@ -0,0 +1,58 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014-2016 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package module.decode.ltrstandard.message;
+
+import message.MessageDirection;
+import message.MessageType;
+import alias.AliasList;
+import bits.BinaryMessage;
+import edac.CRC;
+
+public class UnknownMessage extends LTRStandardMessage
+{
+	public UnknownMessage( BinaryMessage message, MessageDirection direction, 
+			AliasList list, CRC crc )
+    {
+    	super( message, direction, list, crc );
+    }
+
+	@Override
+	public MessageType getMessageType()
+	{
+		return MessageType.UN_KNWN;
+	}
+
+	@Override
+    public String getMessage()
+    {
+		StringBuilder sb = new StringBuilder();
+
+		sb.append( "UNKNOWN AREA:" );
+		sb.append( getArea() );
+		sb.append( " LCN:" );
+		sb.append( getChannelFormatted() );
+		sb.append( " HOME:" );
+		sb.append( getHomeRepeaterFormatted() );
+		sb.append( " GRP:" );
+		sb.append( getGroupFormatted() );
+		sb.append( " FREE:" );
+		sb.append( getFreeFormatted() );
+
+		return sb.toString();
+    }
+}