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diff --git a/epan/dissectors/asn1/isdn-sup/User-To-User-Signalling-Operations.asn b/epan/dissectors/asn1/isdn-sup/User-To-User-Signalling-Operations.asn
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+--
+-- EN 300 286-1 Ver. 1.2.4
+--
+
+User-To-User-Signalling-Operations {ccitt identified-organization etsi(0) 286
+                                    operations-and-errors(1)}
+
+DEFINITIONS ::=
+BEGIN
+
+EXPORTS                 UserUserService, RejectedByUser, RejectedByNetwork, Service, Preferred;
+
+IMPORTS                 OPERATION, ERROR 
+                        FROM Remote-Operations-Information-Objects 
+    {joint-iso-itu-t (2) remote-operations (4) informationObjects(5) version1(0)};
+
+  userUserService OPERATION ::=
+    {
+      ARGUMENT UserUserServiceArg 
+      ERRORS {
+        rejectedByTheUser |
+        rejectedByTheNetwork }   
+        
+      CODE local:1       
+    }
+
+UserUserServiceArg ::= SEQUENCE {
+          service   [1] IMPLICIT Service,
+          preferred [2] IMPLICIT Preferred }
+
+Service                 ::= INTEGER {
+                                service1 (1), 
+                                service2 (2), 
+                                service3 (3)}
+                                (1..3)
+
+Preferred               ::= BOOLEAN     -- True  = preferred request
+                                        -- False = required request
+rejectedByTheNetwork ERROR ::= {CODE local:1}
+rejectedByTheUser    ERROR ::= {CODE local:2}
+
+
+--userUserService UserUserService     ::= 1
+--rejectedByNetwork RejectedByNetwork ::= 1
+--rejectedByUser RejectedByUser       ::= 2
+
+END -- of User-To-User-Signalling-Operations
+