diff --git a/33128/r19/TS33128Payloads.asn b/33128/r19/TS33128Payloads.asn
index 182730dd56a2edfa117ed2ec9770afb9e88eba21..d4e5927f64dbd6b472b675e4cf502d9e8fd49e47 100644
--- a/33128/r19/TS33128Payloads.asn
+++ b/33128/r19/TS33128Payloads.asn
@@ -278,7 +278,12 @@ XIRIEvent ::= CHOICE
     uDMProSeTargetAuthentication                        [160] UDMProSeTargetAuthentication,
 
     -- IP Packet Report, see clause 6.2.3.9.5
-    iPIRIPacketReport                                   [161] IPAccessPDU.IPIRIPacketReport
+    iPIRIPacketReport                                   [161] IPAccessPDU.IPIRIPacketReport,
+
+    -- IMS events, see clause 7.12.4.2, continued from tag 107
+    iMSDataChannelSetup                                 [162] IMSDataChannelSetup,
+    iMSDataChannelModification                          [163] IMSDataChannelModification,
+    iMSDataChannelTermination                           [164] IMSDataChannelTermination
 }
 
 -- ==============
@@ -538,9 +543,14 @@ IRIEvent ::= CHOICE
 
     -- UDM events, see clause 7.2.2.3, continued from tag 124
     uDMProSeTargetIdentifierDeconcealment               [159] UDMProSeTargetIdentifierDeconcealment,
-    uDMProSeTargetAuthentication                        [160] UDMProSeTargetAuthentication
+    uDMProSeTargetAuthentication                        [160] UDMProSeTargetAuthentication,
 
     -- Tag 161 is reserved because there is no equivalent IP Packet Report in IRIEvent.
+
+    -- IMS events, see clause 7.12.7, continued from tag 107
+    iMSDataChannelSetup                                 [162] IMSDataChannelSetup,
+    iMSDataChannelModification                          [163] IMSDataChannelModification,
+    iMSDataChannelTermination                           [164] IMSDataChannelTermination
 }
 
 IRITargetIdentifier ::= SEQUENCE
@@ -4532,6 +4542,36 @@ IMSCCUnavailable ::= SEQUENCE
     sDPState              [2] OCTET STRING OPTIONAL
 }
 
+-- See clause 7.12.4.2.X for details of this structure
+IMSDataChannelSetup ::= SEQUENCE
+{
+    targetIdentity            [1] IMPU,
+    callingIdentity           [2] IMPU OPTIONAL,
+    calledIdentity            [3] SEQUENCE (SIZE (1..MAX)) OF IMPU OPTIONAL,
+    sessionEventNotification  [4] SBIType OPTIONAL,
+    mediaInstructionData      [5] SBIType OPTIONAL
+}
+
+-- See clause 7.12.4.2.Y for details of this structure
+IMSDataChannelModification ::= SEQUENCE
+{
+    targetIdentity            [1] IMPU,
+    callingIdentity           [2] IMPU OPTIONAL,
+    calledIdentity            [3] SEQUENCE (SIZE (1..MAX)) OF IMPU OPTIONAL,
+    sessionEventNotification  [4] SBIType OPTIONAL,
+    mediaInstructions         [5] SBIType OPTIONAL
+}
+
+-- See Clause 7.12.4.2.Z for details of this structure
+IMSDataChannelTermination ::= SEQUENCE
+{
+    targetIdentity            [1] IMPU,
+    callingIdentity           [2] IMPU OPTIONAL,
+    calledIdentity            [3] SEQUENCE (SIZE (1..MAX)) OF IMPU OPTIONAL,
+    sessionEventNotification  [4] SBIType OPTIONAL,
+    mediaInstructionData      [5] SBIType OPTIONAL
+}
+
 -- =========
 -- IMS CCPDU
 -- =========
diff --git a/testing/asn_lint_exceptions.json b/testing/asn_lint_exceptions.json
index 7bafe4ba3a34ee73ccd85b674f82cd6b4588f86d..300225caf915b332e222ebceb954b88e7457bcaa 100644
--- a/testing/asn_lint_exceptions.json
+++ b/testing/asn_lint_exceptions.json
@@ -86,6 +86,7 @@
         "Tag 6 missing in LALSReport",
         "Tag 8 missing in MMEStartOfInterceptionWithEPSAttachedUE",
         "Tag 11 missing in MMEStartOfInterceptionWithEPSAttachedUE",
-        "Tag 161 XIRIEvent field 'iPIRIPacketReport' is not present in IRIEvent"
+        "Tag 161 XIRIEvent field 'iPIRIPacketReport' is not present in IRIEvent",
+        "Tag 161 missing in IRIEvent"
     ]
 }