diff --git a/asn1/sabp/SABP-PDU-Descriptions.asn b/asn1/sabp/SABP-PDU-Descriptions.asn
new file mode 100644
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+++ b/asn1/sabp/SABP-PDU-Descriptions.asn
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+-- **************************************************************
+--
+-- Elementary Procedure definitions
+--
+-- **************************************************************
+SABP-PDU-Descriptions {
+itu-t (0) identified-organization (4) etsi (0) mobileDomain (0)
+umts-Access (20) modules (3) sabp (3) version1 (1) sabp-PDU-Descriptions (0)}
+DEFINITIONS AUTOMATIC TAGS ::=
+BEGIN
+-- **************************************************************
+--
+-- IE parameter types from other modules.
+--
+-- **************************************************************
+IMPORTS
+ Criticality,
+ ProcedureCode
+FROM SABP-CommonDataTypes
+ Error-Indication,
+ Failure,
+ Kill,
+ Kill-Complete,
+ Kill-Failure,
+ Load-Query,
+ Load-Query-Complete,
+ Load-Query-Failure,
+ Reset,
+ Reset-Complete,
+ Reset-Failure,
+ Restart,
+ Message-Status-Query,
+ Message-Status-Query-Complete,
+ Message-Status-Query-Failure,
+ Write-Replace,
+ Write-Replace-Complete,
+ Write-Replace-Failure
+FROM SABP-PDU-Contents
+ id-Error-Indication,
+ id-Failure-Indication,
+ id-Kill,
+ id-Reset, 
+ id-Restart-Indication,
+ id-Load-Status-Enquiry,
+ id-Message-Status-Query,
+ id-Write-Replace
+FROM SABP-Constants;
+-- **************************************************************
+--
+-- Interface Elementary Procedure Class
+--
+-- **************************************************************
+SABP-ELEMENTARY-PROCEDURE ::= CLASS {
+ &InitiatingMessage ,
+ &SuccessfulOutcome OPTIONAL,
+ &UnsuccessfulOutcome OPTIONAL,
+ &procedureCode ProcedureCode UNIQUE,
+ &criticality Criticality DEFAULT ignore
+}
+WITH SYNTAX {
+ INITIATING MESSAGE &InitiatingMessage
+ [SUCCESSFUL OUTCOME
+&SuccessfulOutcome]
+ [UNSUCCESSFUL OUTCOME &UnsuccessfulOutcome]
+ PROCEDURE CODE &procedureCode
+ [CRITICALITY &criticality]
+}
+-- **************************************************************
+--
+-- Interface PDU Definition
+--
+-- **************************************************************
+SABP-PDU ::= CHOICE {
+ initiatingMessage InitiatingMessage,
+ successfulOutcome SuccessfulOutcome,
+ unsuccessfulOutcome UnsuccessfulOutcome,
+ ...
+}
+InitiatingMessage ::= SEQUENCE {
+ procedureCode SABP-ELEMENTARY-PROCEDURE.&procedureCode ({SABP-ELEMENTARY-PROCEDURES}),
+ criticality SABP-ELEMENTARY-PROCEDURE.&criticality ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode}),
+ value SABP-ELEMENTARY-PROCEDURE.&InitiatingMessage ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode})
+}
+SuccessfulOutcome ::= SEQUENCE {
+ procedureCode SABP-ELEMENTARY-PROCEDURE.&procedureCode ({SABP-ELEMENTARY-PROCEDURES}),
+ criticality SABP-ELEMENTARY-PROCEDURE.&criticality ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode}),
+ value SABP-ELEMENTARY-PROCEDURE.&SuccessfulOutcome ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode})
+} 
+UnsuccessfulOutcome ::= SEQUENCE {
+ procedureCode SABP-ELEMENTARY-PROCEDURE.&procedureCode ({SABP-ELEMENTARY-PROCEDURES}),
+ criticality SABP-ELEMENTARY-PROCEDURE.&criticality ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode}),
+ value SABP-ELEMENTARY-PROCEDURE.&UnsuccessfulOutcome ({SABP-ELEMENTARY-PROCEDURES}{@procedureCode})
+}
+-- **************************************************************
+--
+-- Interface Elementary Procedure List
+--
+-- **************************************************************
+SABP-ELEMENTARY-PROCEDURES SABP-ELEMENTARY-PROCEDURE ::= {
+ SABP-ELEMENTARY-PROCEDURES-CLASS-1 |
+ SABP-ELEMENTARY-PROCEDURES-CLASS-2 ,
+ ...
+}
+SABP-ELEMENTARY-PROCEDURES-CLASS-1 SABP-ELEMENTARY-PROCEDURE ::= {
+ write-Replace |
+ kill |
+ load-Status-Enquiry |
+ message-Status-Query |
+ reset ,
+ ...
+}
+SABP-ELEMENTARY-PROCEDURES-CLASS-2 SABP-ELEMENTARY-PROCEDURE ::= {
+ restart-Indication |
+ failure-Indication |
+ error-Indication ,
+ ...
+}
+write-Replace SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Write-Replace
+ SUCCESSFUL OUTCOME Write-Replace-Complete
+ UNSUCCESSFUL OUTCOME Write-Replace-Failure
+ PROCEDURE CODE id-Write-Replace
+ CRITICALITY reject
+}
+kill SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Kill
+ SUCCESSFUL OUTCOME Kill-Complete
+ UNSUCCESSFUL OUTCOME Kill-Failure
+ PROCEDURE CODE id-Kill
+ CRITICALITY reject
+}
+load-Status-Enquiry SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Load-Query
+ SUCCESSFUL OUTCOME Load-Query-Complete
+ UNSUCCESSFUL OUTCOME Load-Query-Failure 
+ PROCEDURE CODE id-Load-Status-Enquiry
+ CRITICALITY reject
+}
+message-Status-Query SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Message-Status-Query
+ SUCCESSFUL OUTCOME Message-Status-Query-Complete
+ UNSUCCESSFUL OUTCOME Message-Status-Query-Failure
+ PROCEDURE CODE id-Message-Status-Query
+ CRITICALITY reject
+}
+reset SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Reset
+ SUCCESSFUL OUTCOME Reset-Complete
+ UNSUCCESSFUL OUTCOME Reset-Failure
+ PROCEDURE CODE id-Reset
+ CRITICALITY reject
+}
+restart-Indication SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Restart
+ PROCEDURE CODE id-Restart-Indication
+ CRITICALITY ignore
+}
+failure-Indication SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Failure
+ PROCEDURE CODE id-Failure-Indication
+ CRITICALITY ignore
+}
+error-Indication SABP-ELEMENTARY-PROCEDURE ::= {
+ INITIATING MESSAGE Error-Indication
+ PROCEDURE CODE id-Error-Indication
+ CRITICALITY ignore
+}
+END