diff --git a/ISUPExtensions.st b/ISUPExtensions.st
new file mode 100644
index 0000000..63681e6
--- /dev/null
+++ b/ISUPExtensions.st
@@ -0,0 +1,32 @@
+"
+ (C) 2012 by Holger Hans Peter Freyther
+ All Rights Reserved
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.
+"
+
+ISUPNatureOfConnectionIndicators class extend [
+    satNoSat    [ <category: '*-isup-extension'> ^ 2r00 ]
+    satOneSat   [ <category: '*-isup-extension'> ^ 2r01 ]
+    satTwoSat   [ <category: '*-isup-extension'> ^ 2r10 ]
+    satSpare    [ <category: '*-isup-extension'> ^ 2r11 ]
+
+    cciNotRequired  [ <category: '*-isup-extension'> ^ 2r00 ]
+    cciRequired     [ <category: '*-isup-extension'> ^ 2r01 ]
+    cciPerformed    [ <category: '*-isup-extension'> ^ 2r10 ]
+    cciSpare        [ <category: '*-isup-extension'> ^ 2r11 ]
+
+    ecdiNotIncluded [ <category: '*-isup-extension'> ^ 2r0 ]
+    ecdiIncluded    [ <category: '*-isup-extension'> ^ 2r1 ]
+]
diff --git a/package.xml b/package.xml
index f7a40ca..b184a4a 100644
--- a/package.xml
+++ b/package.xml
@@ -8,6 +8,7 @@
     <filein>MessageStructure.st</filein>
     <filein>ISUP.st</filein>
     <filein>isup_generated.st</filein>
+    <filein>ISUPExtensions.st</filein>
     <filein>IPAConstants.st</filein>
     <filein>IPADispatcher.st</filein>
     <filein>IPAMuxer.st</filein>