diff --git a/asn1/TCAP-Tools.asn b/asn1/TCAP-Tools.asn
new file mode 100644
index 0000000..09ea9d9
--- /dev/null
+++ b/asn1/TCAP-Tools.asn
@@ -0,0 +1,47 @@
+-- Generated by Asnp, the pretty-printer of France Telecom R&D (http://asn1.elibel.tm.fr/asnp/)
+TCAP-Tools {itu-t recommendation q 775 modules(2) tools(1) version1(1)}
+DEFINITIONS ::=
+BEGIN
+
+EXPORTS 
+	cancel, 
+	cancelFailed, 
+	cancelled
+;
+
+IMPORTS
+  OPERATION, ERROR
+    FROM Remote-Operations-Information-Objects {joint-iso-itu-t
+      remote-operations(4) informationObjects(5) version1(0)}
+
+  TCInvokeIdSet
+    FROM TCAPMessages {itu-t recommendation q 773 modules(2) messages(1)
+      version3(3)}
+;
+
+cancel OPERATION ::= {
+  ARGUMENT  present < TCInvokeIdSet
+  -- a TC-user may redefine this type to include
+  -- an empty result so that it becomes a Class 1 operation
+  ERRORS    {cancelFailed}
+}
+
+-- timer = 15 s
+cancelFailed ERROR ::= {
+  PARAMETER
+    SET {problem   [0]  CancelProblem,
+         invokeId  [1]  present < TCInvokeIdSet}
+}
+
+CancelProblem ::= ENUMERATED {
+  unknownInvocation(0), tooLate(1), notCancellable(2)}
+
+-- a TC-user may redefine this type to include application-specific problems
+cancelled ERROR ::=
+  {}
+
+-- an error of this type should be included in the error list of cancellable operations
+END
+
+-- Generated by Asnp, the ASN.1 pretty-printer of France Telecom R&D
+