P25 Work in progress. Adds CRC checking to NID/DUID. Adds limiter to trellis decoder to prevent it from decoding an excessive error message. Updates channel state with initial handling/generation of call events.

src/decode/p25/message/tsbk/osp/voice/UnitToUnitVoiceChannelGrant.java

@@ -3,6 +3,7 @@ package decode.p25.message.tsbk.osp.voice;
 import alias.AliasList;
 import bits.BitSetBuffer;
 import decode.p25.message.tsbk.UnitChannelGrant;
+import decode.p25.message.tsbk.osp.control.IdentifierUpdate;
 import decode.p25.reference.DataUnitID;
 import decode.p25.reference.Opcode;
 
@@ -20,4 +21,28 @@ public class UnitToUnitVoiceChannelGrant extends UnitChannelGrant
     {
         return Opcode.UNIT_TO_UNIT_VOICE_CHANNEL_GRANT.getDescription();
     }
+    
+    public String getMessage()
+    {
+        StringBuilder sb = new StringBuilder();
+        
+        sb.append( getMessageStub() );
+        
+        if( isEmergency() )
+        {
+            sb.append( " EMERGENCY" );
+        }
+        
+        sb.append( " SOURCE UNIT:" );
+        sb.append( getSourceAddress() );
+        
+        sb.append( " TARGET UNIT:" );
+        sb.append( getTargetAddress() );
+
+        sb.append( " CHAN:" + getChannelIdentifier() + "-" + getChannel() );
+        sb.append( " DN:" + getDownlinkFrequency() );
+        sb.append( " UP:" + getUplinkFrequency() );
+        
+        return sb.toString();
+    }
 }