add RUA asn.1 syntax from 3GPP TS 25.468 V12.1.0 (2014-12)
diff --git a/asn1/rua/RUA-Constants.asn b/asn1/rua/RUA-Constants.asn
new file mode 100644
index 0000000..636b4d5
--- /dev/null
+++ b/asn1/rua/RUA-Constants.asn
@@ -0,0 +1,55 @@
+-- **************************************************************
+--
+-- Constant definitions
+--
+-- **************************************************************
+
+RUA-Constants {
+itu-t (0) identified-organization (4) etsi (0) mobileDomain (0)
+umts-Access (20) modules (3) rua(5) version1 (1) rUA-Constants (4) }
+
+DEFINITIONS AUTOMATIC TAGS ::=
+
+BEGIN
+
+IMPORTS
+ ProcedureCode,
+ ProtocolIE-ID
+FROM RUA-CommonDataTypes;
+
+
+-- **************************************************************
+--
+-- Elementary Procedures
+--
+id-Connect ProcedureCode ::= 1
+id-DirectTransfer ProcedureCode ::= 2
+id-Disconnect ProcedureCode ::= 3
+id-ConnectionlessTransfer ProcedureCode ::= 4
+id-ErrorIndication ProcedureCode ::= 5
+id-privateMessage ProcedureCode ::= 6
+
+-- **************************************************************
+--
+-- Lists
+--
+-- **************************************************************
+maxNrOfErrors INTEGER ::= 256
+
+-- **************************************************************
+--
+-- IEs
+--
+-- **************************************************************
+
+id-Cause ProtocolIE-ID ::= 1
+id-CriticalityDiagnostics ProtocolIE-ID ::= 2
+id-Context-ID ProtocolIE-ID ::= 3
+id-RANAP-Message ProtocolIE-ID ::= 4
+id-IntraDomainNasNodeSelector ProtocolIE-ID ::= 5
+id-Establishment-Cause ProtocolIE-ID ::= 6
+id-CN-DomainIndicator ProtocolIE-ID ::= 7
+id-CSGMembershipStatus ProtocolIE-ID ::= 9
+
+
+END