diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/BTService.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/BTService.java
index f713f724a..43b32b7e5 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/BTService.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/BTService.java
@@ -104,6 +104,7 @@ public class BTService extends XWService {
         MESG_DECL,
         MESG_GAMEGONE,
         REMOVE_FOR,
+        INVITE_DUP_INVITE,
     };
 
     private class BTQueueElem {
@@ -372,12 +373,6 @@ public class BTService extends XWService {
                     String jsonData = intent.getStringExtra( GAMEDATA_KEY );
                     NetLaunchInfo nli = new NetLaunchInfo( this, jsonData );
                     DbgUtils.logf( "onStartCommand: nli: %s", nli.toString() );
-                    // int gameID = intent.getIntExtra( GAMEID_KEY, -1 );
-                    // String btAddr = intent.getStringExtra( ADDR_KEY );
-                    // String gameName = intent.getStringExtra( GAMENAME_KEY );
-                    // int lang = intent.getIntExtra( LANG_KEY, -1 );
-                    // String dict = intent.getStringExtra( DICT_KEY );
-                    // int nPlayersT = intent.getIntExtra( NTO_KEY, -1 );
                     String btAddr = intent.getStringExtra( ADDR_KEY );
                     m_sender.add( new BTQueueElem( BTCmd.INVITE, nli, btAddr ) );
                     break;
@@ -1055,16 +1050,20 @@ public class BTService extends XWService {
                                 String btAddr )
     {
         BTCmd result;
-        if ( DictLangCache.haveDict( this, nli.lang, nli.dict ) ) {
-            result = makeGame( nli, btName, btAddr );
+        if ( checkNotDupe( nli ) ) {
+            if ( DictLangCache.haveDict( this, nli.lang, nli.dict ) ) {
+                result = makeGame( nli, btName, btAddr );
+            } else {
+                Intent intent = MultiService
+                    .makeMissingDictIntent( this, nli, 
+                                            DictFetchOwner.OWNER_BT );
+                // NetLaunchInfo.putExtras( intent, gameID, btName, btAddr );
+                MultiService.postMissingDictNotification( this, intent, 
+                                                          nli.gameID() );
+                result = BTCmd.INVITE_ACCPT; // ???
+            }
         } else {
-            Intent intent = MultiService
-                .makeMissingDictIntent( this, nli, 
-                                        DictFetchOwner.OWNER_BT );
-            // NetLaunchInfo.putExtras( intent, gameID, btName, btAddr );
-            MultiService.postMissingDictNotification( this, intent, 
-                                                      nli.gameID() );
-            result = BTCmd.INVITE_ACCPT; // ???
+            result = BTCmd.INVITE_DUP_INVITE; // dupe of rematch 
         }
         return result;
     }
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/RelayService.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/RelayService.java
index 02d87dd04..270bc41df 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/RelayService.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/RelayService.java
@@ -226,7 +226,9 @@ public class RelayService extends XWService
     {
         DbgUtils.logdf( "receiveInvitation: got nli from %d: %s", srcDevID,
                        nli.toString() );
-        makeOrNotify( nli );
+        if ( checkNotDupe( nli ) ) {
+            makeOrNotify( nli );
+        }
     }
 
     private void makeOrNotify( NetLaunchInfo nli )
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/SMSService.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/SMSService.java
index 43ef149a6..f6c06dac8 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/SMSService.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/SMSService.java
@@ -502,7 +502,7 @@ public class SMSService extends XWService {
             case INVITE:
                 String nliData = dis.readUTF();
                 NetLaunchInfo nli = new NetLaunchInfo( this, nliData );
-                if ( nli.isValid() ) {
+                if ( nli.isValid() && checkNotDupe( nli ) ) {
                     if ( DictLangCache.haveDict( this, nli.lang, nli.dict ) ) {
                         makeForInvite( phone, nli );
                     } else {
diff --git a/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWService.java b/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWService.java
index d2d466454..eb1be40ac 100644
--- a/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWService.java
+++ b/xwords4/android/XWords4/src/org/eehouse/android/xw4/XWService.java
@@ -24,12 +24,16 @@ import android.app.Service;
 import android.content.Intent;
 import android.os.IBinder;
 
+import java.util.HashSet;
+import java.util.Set;
+
 import org.eehouse.android.xw4.MultiService.MultiEvent;
 
 
 public class XWService extends Service {
 
     protected static MultiService s_srcMgr = null;
+    private static Set<String> s_seen = new HashSet<String>();
 
     @Override
     public IBinder onBind( Intent intent )
@@ -54,4 +58,20 @@ public class XWService extends Service {
             DbgUtils.logf( "XWService.sendResult: dropping %s event", event.toString() );
         }
     }
+
+    // Check that we aren't already processing an invitation with this
+    // inviteID.
+    protected boolean checkNotDupe( NetLaunchInfo nli )
+    {
+        String inviteID = nli.inviteID();
+        boolean isDupe;
+        synchronized( s_seen ) {
+            isDupe = s_seen.contains( inviteID );
+            if ( !isDupe ) {
+                s_seen.add( inviteID );
+            }
+        }
+        DbgUtils.logf( "XWService.checkNotDupe(%s) => %b", inviteID, !isDupe );
+        return !isDupe;
+    }
 }