diff --git a/33128/r18/TS33128Payloads.asn b/33128/r18/TS33128Payloads.asn
index 4ab112bf2a4fdca6b1207a1a571c7e2bde021825..7659f718673bc5b2f993cf1843141689e67e175f 100644
--- a/33128/r18/TS33128Payloads.asn
+++ b/33128/r18/TS33128Payloads.asn
@@ -4039,7 +4039,14 @@ IMSCCPDUPayload ::= OCTET STRING
 
 IMSPayload ::= CHOICE
 {
-    encapsulatedSIPMessage            [1] SIPMessage
+    encapsulatedSIPMessage            [1] SIPMessage,
+    modifiedSIPMessage                [2] ModifiedSIPMessage
+}
+
+ModifiedSIPMessage ::= SEQUENCE
+{
+    modifiedSIPContent [1] SIPMessage,
+    modifications      [2] PayloadModifications
 }
 
 SIPMessage ::= SEQUENCE
@@ -6691,7 +6698,8 @@ SIPCellularNetworkInformation ::= SEQUENCE
 
 RCSPayload ::= CHOICE
 {
-    fullPayload     [1] EncapsulatedRCSPayload
+    fullPayload     [1] EncapsulatedRCSPayload,
+    modifiedPayload [2] ModifiedRCSPayload
 }
 
 EncapsulatedRCSPayload ::= CHOICE
@@ -6701,6 +6709,82 @@ EncapsulatedRCSPayload ::= CHOICE
     sIP  [3] SIPMessage
 }
 
+ModifiedRCSPayload ::= SEQUENCE
+{
+    modifiedRCSPayload [1] EncapsulatedRCSPayload,
+    modifications      [2] PayloadModifications
+}
+
+PayloadModifications ::= SEQUENCE
+{
+    modificationList [1] SEQUENCE OF PayloadModification
+}
+
+PayloadModification ::= CHOICE
+{
+    predefinedModification [1] PredefinedPayloadModification,
+    describedModification  [2] PayloadModificationDescription
+}
+
+PredefinedPayloadModification ::= ENUMERATED
+{
+    pANILocationRemoval(1),
+    cNILocationRemoval(2),
+    sIPGeolocationInfoRemoval(3),
+    presenceInformationLocationRemoval(4),
+    tS33128SMSTPDURedaction(5),
+    tS33128TruncatedSMSTPDU(6),
+    iMSTextContentRemoval(7),
+    iMSSubjectContentRemoval(8)
+}
+
+PayloadModificationDescription ::= SEQUENCE
+{
+    modificationLocation [1] ModificationLocation,
+    modificationType     [2] ModificationType
+}
+
+ModificationLocation ::= CHOICE
+{
+    jSONPointer        [1] UTF8String,
+    xPath              [2] UTF8String,
+    sIPHeader          [3] UTF8String,
+    sIPBody            [4] NULL,
+    mIMEHeader         [5] UTF8String,
+    mIMEBody           [6] MIMEBody,
+    uTF8Location       [7] IndexRange,
+    octetLocation      [8] IndexRange,
+    aBNFRule           [9] ABNFRuleLocation
+}
+
+ABNFRuleLocation ::= UTF8String
+
+ModificationType ::= CHOICE
+{
+    removed                  [1] PayloadInformationRemoved,
+    replacedWithCharacters   [2] PayloadInformationReplacedWithCharacters,
+    replacedWithOctets       [3] OCTET STRING,
+    replacedWithBits         [4] BIT STRING
+}
+
+PayloadInformationRemoved ::= CHOICE
+{
+    charactersRemoved [1] INTEGER,
+    octetsRemoved     [2] INTEGER,
+    bitsRemoved       [3] INTEGER
+}
+
+PayloadInformationReplacedWithCharacters ::= SEQUENCE
+{
+    characters [1] UTF8String
+}
+
+IndexRange ::= SEQUENCE
+{
+    start [1] INTEGER,
+    end   [2] INTEGER
+}
+
 -- ===============================================
 -- Externally Defined Structures - MSRP Parameters
 -- ===============================================