--- src-reference/minecraft_server/net/minecraft/src/NetServerHandler.java	0000-00-00 00:00:00.000000000 -0000
+++ src-work/minecraft_server/net/minecraft/src/NetServerHandler.java	0000-00-00 00:00:00.000000000 -0000
@@ -3,6 +3,8 @@
 import java.util.ArrayList;
 import java.util.Random;
 import java.util.logging.Logger;
+
+import cpw.mods.fml.server.FMLHandler;
 import net.minecraft.server.MinecraftServer;
 
 public class NetServerHandler extends NetHandler implements ICommandListener
@@ -558,7 +560,10 @@
                 }
             }
 
-            if (var2.startsWith("/"))
+            if (FMLHandler.instance().handleChatPacket(p_23_1_,field_16_e)) {
+              // We handled it
+            }
+            else if (var2.startsWith("/"))
             {
                 this.func_4010_d(var2);
             }
@@ -898,4 +903,9 @@
     {
         this.field_16_e.field_35214_K.field_35658_b = p_50003_1_.field_50005_b && this.field_16_e.field_35214_K.field_35659_c;
     }
+
+    @Override
+    public void func_44001_a(Packet250CustomPayload p_44001_1_) {
+      FMLHandler.instance().handlePacket250(p_44001_1_, field_16_e);
+    }
 }

Update patches for network handler
Update patches for network handler