diff --git a/33128/r17/TS33128Payloads.asn b/33128/r17/TS33128Payloads.asn
index ed06cedc9caa91e916284031756b8c411c2bc662..a0ec4d8e3a8df84021faf5ee91c997b46a59a702 100644
--- a/33128/r17/TS33128Payloads.asn
+++ b/33128/r17/TS33128Payloads.asn
@@ -1,5 +1,5 @@
 TS33128Payloads
-{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) threeGPP(4) ts33128(19) r17(17) version1(1)}
+{itu-t(0) identified-organization(4) etsi(0) securityDomain(2) lawfulIntercept(2) threeGPP(4) ts33128(19) r17(17) version2(2)}
 
 DEFINITIONS IMPLICIT TAGS EXTENSIBILITY IMPLIED ::=
 
@@ -9,7 +9,7 @@ BEGIN
 -- Relative OIDs
 -- =============
 
-tS33128PayloadsOID          RELATIVE-OID ::= {threeGPP(4) ts33128(19) r17(17) version1(1)}
+tS33128PayloadsOID          RELATIVE-OID ::= {threeGPP(4) ts33128(19) r17(17) version2(2)}
 
 xIRIPayloadOID              RELATIVE-OID ::= {tS33128PayloadsOID xIRI(1)}
 xCCPayloadOID               RELATIVE-OID ::= {tS33128PayloadsOID xCC(2)}
@@ -169,6 +169,10 @@ XIRIEvent ::= CHOICE
     n9HRPDUSessionInfo                                  [100] N9HRPDUSessionInfo,
     s8HRBearerInfo                                      [101] S8HRBearerInfo,
 
+    -- IMS events, see clause 7.X.4.2
+    iMSMessage                                          [2721] IMSMessage,
+    startOfInterceptionForActiveIMSSession              [2722] StartOfInterceptionForActiveIMSSession,
+
     -- Separated Location Reporting, see clause 7.3.X
     separatedLocationReporting                          [2731] SeparatedLocationReporting
 }
@@ -332,6 +336,10 @@ IRIEvent ::= CHOICE
     -- tag 100 is reserved because there is no equivalent n9HRPDUSessionInfo in IRIEvent.
     -- tag 101 is reserved because there is no equivalent S8HRBearerInfo in IRIEvent.
 
+    -- IMS events, see clause 7.X.4.2
+    iMSMessage                                          [2721] IMSMessage,
+    startOfInterceptionForActiveIMSSession              [2722] StartOfInterceptionForActiveIMSSession,
+
     -- Separated Location Reporting, see clause 7.3.X
     separatedLocationReporting                          [2731] SeparatedLocationReporting
 }
@@ -2782,6 +2790,61 @@ PTCAccessPolicyFailure  ::= ENUMERATED
     requestUnsuccessful(1),
     requestUnknown(2)
 }
+-- ===============
+-- IMS definitions
+-- ===============
+
+-- See clause 7.X.4.2.1 for details of this structure
+IMSMessage ::= SEQUENCE
+{
+    payload               [1] IMSPayload,
+    sessionDirection      [2] SessionDirection,
+    voIPRoamingIndication [3] VoIPRoamingIndication OPTIONAL,
+    location              [6] Location OPTIONAL
+}
+-- See clause 7.X.4.2.3 for details of this structure
+StartOfInterceptionForActiveIMSSession ::= SEQUENCE
+{
+    originatingId         [1] SEQUENCE OF IMPU,
+    terminatingId         [2] IMPU,
+    sDPState              [3] SEQUENCE OF OCTET STRING OPTIONAL,
+    diversionIdentity     [4] IMPU OPTIONAL,
+    voIPRoamingIndication [5] VoIPRoamingIndication OPTIONAL,
+    location              [7] Location OPTIONAL
+}
+
+-- ==============
+-- IMS parameters
+-- ==============
+
+IMSPayload ::= CHOICE
+{
+    encapsulatedSIPMessage            [1] SIPMessage
+}
+
+SIPMessage ::= SEQUENCE
+{
+    iPSourceAddress       [1] IPAddress,
+    iPDestinationAddress  [2] IPAddress,
+    sIPContent            [3] OCTET STRING
+}
+
+VoIPRoamingIndication ::= ENUMERATED
+{
+    roamingLBO(1),
+    roamingS8HR(2),
+    roamingN9HR(3)
+}
+
+SessionDirection ::= ENUMERATED
+{
+    fromTarget(1), 
+    toTarget(2),
+    combined(3),
+    indeterminate(4)
+}
+
+HeaderOnlyIndication ::= BOOLEAN
 
 -- ===================
 -- 5G LALS definitions