diff --git a/src/dsd_frame_sync.c b/src/dsd_frame_sync.c
index a6a3c07..272cc17 100644
--- a/src/dsd_frame_sync.c
+++ b/src/dsd_frame_sync.c
@@ -296,7 +296,7 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
       }
 
 
-      if (1 == 1) 
+      if (1 == 1)
       {
         if (symbol > state->center)
         {
@@ -631,10 +631,17 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
                 {
                   printFrameSync (opts, state, "+P25p2 SISCH", synctest_pos + 1, modulation);
                 }
-                if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+                if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+          					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
             		{
             			fprintf (stderr, " WACN [%05llX] SYS [%03llX] NAC [%03llX] ", state->p2_wacn, state->p2_sysid, state->p2_cc);
             		}
+                else if (state->p2_wacn == 0xFFFFF || state->p2_cc == 0xFFF || state->p2_sysid == 0xFFF)
+            		{
+                  fprintf (stderr, "%s", KRED);
+            			fprintf (stderr, " P2 Invalid Parameters            ");
+            			fprintf (stderr, "%s", KNRM);
+            		}
             		else
             		{
             			fprintf (stderr, "%s", KRED);
@@ -665,11 +672,16 @@ getFrameSync (dsd_opts * opts, dsd_state * state)
                 {
                   printFrameSync (opts, state, "-P25p2 SISCH", synctest_pos + 1, modulation);
                 }
-                if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+                if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+          					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
             		{
-            			//fprintf (stderr, "%s", KCYN);
             			fprintf (stderr, " WACN [%05llX] SYS [%03llX] NAC [%03llX] ", state->p2_wacn, state->p2_sysid, state->p2_cc);
-            			//fprintf (stderr, "%s", KNRM);
+            		}
+                else if (state->p2_wacn == 0xFFFFF || state->p2_cc == 0xFFF || state->p2_sysid == 0xFFF)
+            		{
+                  fprintf (stderr, "%s", KRED);
+            			fprintf (stderr, " P2 Invalid Parameters            ");
+            			fprintf (stderr, "%s", KNRM);
             		}
             		else
             		{
diff --git a/src/dsd_ncurses.c b/src/dsd_ncurses.c
index de80ab8..3c5adc0 100644
--- a/src/dsd_ncurses.c
+++ b/src/dsd_ncurses.c
@@ -1989,6 +1989,12 @@ ncursesPrinter (dsd_opts * opts, dsd_state * state)
         printw (" Phase 2 Missing Parameters ");
         attron(COLOR_PAIR(3));
       }
+      if (state->p2_wacn == 0xFFFFF || state->p2_sysid == 0xFFF || state->p2_cc == 0xFFF)
+      {
+        attron(COLOR_PAIR(2));
+        printw (" Phase 2 Invalid Parameters ");
+        attron(COLOR_PAIR(3));
+      }
     }
 
     printw ("\n");
diff --git a/src/p25_p2.c b/src/p25_p2.c
index 382aae6..5347e58 100644
--- a/src/p25_p2.c
+++ b/src/p25_p2.c
@@ -1464,7 +1464,8 @@ void process_P2_DUID (dsd_opts * opts, dsd_state * state)
     if (duid_decoded == 0)
     {
       fprintf (stderr, " 4V %d", state->fourv_counter[state->currentslot]+1);
-			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
 			{
 				process_4V (opts, state);
 			}
@@ -1472,14 +1473,16 @@ void process_P2_DUID (dsd_opts * opts, dsd_state * state)
     else if (duid_decoded == 6)
     {
       fprintf (stderr, " 2V");
-			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
 			{
 				process_2V (opts, state);
 			}
     }
 		else if (duid_decoded == 3)
     {
-			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
 			{
 				process_SACCHs(opts, state);
 			}
@@ -1494,7 +1497,8 @@ void process_P2_DUID (dsd_opts * opts, dsd_state * state)
     }
 		else if (duid_decoded == 9)
     {
-			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
 			{
 				process_FACCHs(opts, state);
 			}
@@ -1512,7 +1516,8 @@ void process_P2_DUID (dsd_opts * opts, dsd_state * state)
       fprintf (stderr, " LCCH Sc"); //w/ scrambling
 			// if (state->currentslot == 0) state->dmrburstL = 31;
 			// else state->dmrburstR = 31;
-			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0)
+			if (state->p2_wacn != 0 && state->p2_cc != 0 && state->p2_sysid != 0 &&
+					state->p2_wacn != 0xFFFFF && state->p2_cc != 0xFFF && state->p2_sysid != 0xFFF)
 			{
 				state->p2_is_lcch = 1;
 				process_SACCHs(opts, state);