Index: core/src/main/java/quickfix/FixVersions.java
===================================================================
--- core/src/main/java/quickfix/FixVersions.java	(revision 952)
+++ core/src/main/java/quickfix/FixVersions.java	(working copy)
@@ -33,6 +33,8 @@
      * FIX 5.0 does not have a begin string.
      */
     public static final String FIX50 = "FIX.5.0";
+    public static final String FIX50SP1 = "FIX.5.0SP1";
+    public static final String FIX50SP2 = "FIX.5.0SP2";
 
     // FIXT.x.x support
     
Index: core/src/main/java/quickfix/MessageCracker.java
===================================================================
--- core/src/main/java/quickfix/MessageCracker.java	(revision 952)
+++ core/src/main/java/quickfix/MessageCracker.java	(working copy)
@@ -49,7 +49,9 @@
             crack43((quickfix.fix43.Message) message, sessionID);
         } else if (beginString.equals(BEGINSTRING_FIX44)) {
             crack44((quickfix.fix44.Message) message, sessionID);
-        } else if (beginString.equals(FIX50)) {
+        } else if (beginString.equals(FIX50)    || 
+                   beginString.equals(FIX50SP1) || 
+                   beginString.equals(FIX50SP2)) {
             crack50((quickfix.fix50.Message) message, sessionID);
         } else if (beginString.equals(BEGINSTRING_FIXT11)) {
             if (MessageUtils.isAdminMessage(message.getHeader().getString(MsgType.FIELD))) {
Index: core/src/main/java/quickfix/MessageUtils.java
===================================================================
--- core/src/main/java/quickfix/MessageUtils.java	(revision 952)
+++ core/src/main/java/quickfix/MessageUtils.java	(working copy)
@@ -243,6 +243,8 @@
             put(ApplVerID.FIX43, FixVersions.BEGINSTRING_FIX43);
             put(ApplVerID.FIX44, FixVersions.BEGINSTRING_FIX44);
             put(ApplVerID.FIX50, FixVersions.FIX50);
+            put(ApplVerID.FIX50SP1, FixVersions.FIX50SP1);
+            put(ApplVerID.FIX50SP2, FixVersions.FIX50SP2);
         }
     };
 
@@ -270,6 +272,8 @@
             put(FixVersions.BEGINSTRING_FIX43, new ApplVerID(ApplVerID.FIX43));
             put(FixVersions.BEGINSTRING_FIX44, new ApplVerID(ApplVerID.FIX44));
             put(FixVersions.FIX50, new ApplVerID(ApplVerID.FIX50));
+            put(FixVersions.FIX50SP1, new ApplVerID(ApplVerID.FIX50SP1));
+            put(FixVersions.FIX50SP2, new ApplVerID(ApplVerID.FIX50SP2));
         }
     };
 
Index: core/src/main/resources/FIX50.xml
===================================================================
--- core/src/main/resources/FIX50.xml	(revision 952)
+++ core/src/main/resources/FIX50.xml	(working copy)
@@ -8167,6 +8167,8 @@
       <value enum="5" description="FIX43"/>
       <value enum="6" description="FIX44"/>
       <value enum="7" description="FIX50"/>
+	  <value enum="8" description="FIX50SP1"/>
+	  <value enum="9" description="FIX50SP2"/>
     </field>
     <field number="1129" name="CstmApplVerID" type="STRING"/>
     <field number="1130" name="RefApplVerID" type="STRING"/>
Index: core/src/main/resources/FIXT11.xml
===================================================================
--- core/src/main/resources/FIXT11.xml	(revision 952)
+++ core/src/main/resources/FIXT11.xml	(working copy)
@@ -302,6 +302,8 @@
             <value description="FIX43" enum="5"/>
             <value description="FIX44" enum="6"/>
             <value description="FIX50" enum="7"/>
+		    <value description="FIX50SP1" enum="8" />
+	        <value description="FIX50SP2" enum="9" />
         </field>
         <field name="CstmApplVerID" number="1129" type="STRING"/>
         <field name="RefApplVerID" number="1130" type="STRING"/>